Result

^{…
2026-03-28 13:52 UTC

2026-03-28 06:59 UTC}

Swing NYOS 2 RS ML (2022)

General Information

Manufacturer	SWING Flugsportgeräte GmbH
Model	NYOS 2 RS
Year	2022
Size	ML
Production date	2022-09
Line chart	Open
Total airtime	51h
Line set airtime	51h
Tolerance	+/- 10mm (Review)

Data integrity & access	Checksum valid

Settings

Manufacturer tolerance

Correction value

The deviation of the measured values from the nominal values is between 12 and 31mm. Adjust the value according to your measuring set-up.
Put a positive value if readings are too short.
Put a negative value if readings are too long.

Wing as seen from above in flight

AI

BI

CI

AII

BII

CII

AIII

BIII

CIII

STI

a10

st1

b10

st2

st3

Br

br1

br2

br3

br4

br5

br6

br7

br8

br9

br10

br11

AI

BI

CI

AII

BII

CII

AIII

BIII

CIII

STI

a10

st1

b10

st2

st3

Br

br1

br2

br3

br4

br5

br6

br7

br8

br9

br10

br11

Offsets relative to median diff (22)

AII

BII

CII

AIII

BIII

CIII

STI

AII

BII

CII

AIII

BIII

CIII

STI

Left riser

nom:

7665.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AI

Formula of calculation:

sum(a1,a2,a3) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7705

rdg:

7732

diff:

nom:

7615

rdg:

7645

diff:

nom:

7675

rdg:

7706

diff:

nom:

7550.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BI

Formula of calculation:

sum(b1,b2,b3) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7590

rdg:

7617

diff:

nom:

7495

rdg:

7519

diff:

nom:

7565

rdg:

7591

diff:

nom:

7682.50

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CI

Formula of calculation:

sum(c1,c2,c3,d1,d2,d3) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7660

rdg:

7679

diff:

nom:

7555

rdg:

7573

diff:

nom:

7615

rdg:

7634

diff:

nom:

7810

rdg:

7823

diff:

nom:

7705

rdg:

7720

diff:

nom:

7750

rdg:

7766

diff:

AII

nom:

7568.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AII

Formula of calculation:

sum(a4,a5,a6) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7635

rdg:

7657

diff:

nom:

7530

rdg:

7555

diff:

nom:

7540

rdg:

7566

diff:

BII

nom:

7478.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BII

Formula of calculation:

sum(b4,b5,b6) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7530

rdg:

7554

diff:

nom:

7440

rdg:

7463

diff:

nom:

7465

rdg:

7487

diff:

CII

nom:

7595.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CII

Formula of calculation:

sum(c4,c5,c6,d4,d5,d6) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7605

rdg:

7621

diff:

nom:

7505

rdg:

7521

diff:

nom:

7510

rdg:

7528

diff:

nom:

7725

rdg:

7741

diff:

nom:

7620

rdg:

7639

diff:

nom:

7605

rdg:

7624

diff:

AIII

nom:

7246.67

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AIII

Formula of calculation:

sum(a7,a8,a9) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7405

rdg:

7430

diff:

nom:

7225

rdg:

7251

diff:

nom:

7110

rdg:

7137

diff:

BIII

nom:

7188.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BIII

Formula of calculation:

sum(b7,b8,b9) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7330

rdg:

7355

diff:

nom:

7170

rdg:

7198

diff:

nom:

7065

rdg:

7089

diff:

CIII

nom:

7275.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CIII

Formula of calculation:

sum(c7,c8,c9,d7,d8,d9) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7390

rdg:

7405

diff:

nom:

7205

rdg:

7224

diff:

nom:

7065

rdg:

7083

diff:

nom:

7510

rdg:

7524

diff:

nom:

7320

rdg:

7338

diff:

nom:

7160

rdg:

7177

diff:

STI

nom:

6747.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group STI

Formula of calculation:

sum(a10,st1,b10,st2,st3) / 5

Statistics of "04"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

a10

nom:

6825

rdg:

6851

diff:

st1

nom:

6690

rdg:

6717

diff:

b10

nom:

6780

rdg:

6807

diff:

st2

nom:

6700

rdg:

6726

diff:

st3

nom:

6740

rdg:

6765

diff:

Left brake

nom:

7393.64

rdg:

diff:

Re-measure

Comment

Averages of group Br

Formula of calculation:

sum(br1,br2,br3,br4,br5,br6,br7,br8,br9,br10,br11) / 11

br1

nom:

8135

rdg:

8055

diff:

br2

nom:

7825

rdg:

7749

diff:

br3

nom:

7705

rdg:

7630

diff:

br4

nom:

7560

rdg:

7489

diff:

br5

nom:

7410

rdg:

7337

diff:

br6

nom:

7365

rdg:

7292

diff:

br7

nom:

7370

rdg:

7295

diff:

br8

nom:

7155

rdg:

7088

diff:

br9

nom:

6990

rdg:

6923

diff:

br10

nom:

6920

rdg:

6855

diff:

br11

nom:

6895

rdg:

6828

diff:

Right riser

nom:

7665.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AI

Formula of calculation:

sum(a1,a2,a3) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7705

rdg:

7735

diff:

nom:

7615

rdg:

7643

diff:

nom:

7675

rdg:

7705

diff:

nom:

7550.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BI

Formula of calculation:

sum(b1,b2,b3) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7590

rdg:

7612

diff:

nom:

7495

rdg:

7518

diff:

nom:

7565

rdg:

7587

diff:

nom:

7682.50

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CI

Formula of calculation:

sum(c1,c2,c3,d1,d2,d3) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7660

rdg:

7676

diff:

nom:

7555

rdg:

7572

diff:

nom:

7615

rdg:

7629

diff:

nom:

7810

rdg:

7823

diff:

nom:

7705

rdg:

7718

diff:

nom:

7750

rdg:

7764

diff:

AII

nom:

7568.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AII

Formula of calculation:

sum(a4,a5,a6) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7635

rdg:

7658

diff:

nom:

7530

rdg:

7559

diff:

nom:

7540

rdg:

7567

diff:

BII

nom:

7478.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BII

Formula of calculation:

sum(b4,b5,b6) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7530

rdg:

7552

diff:

nom:

7440

rdg:

7462

diff:

nom:

7465

rdg:

7485

diff:

CII

nom:

7595.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CII

Formula of calculation:

sum(c4,c5,c6,d4,d5,d6) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7605

rdg:

7617

diff:

nom:

7505

rdg:

7520

diff:

nom:

7510

rdg:

7522

diff:

nom:

7725

rdg:

7740

diff:

nom:

7620

rdg:

7634

diff:

nom:

7605

rdg:

7619

diff:

AIII

nom:

7246.67

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group AIII

Formula of calculation:

sum(a7,a8,a9) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7405

rdg:

7430

diff:

nom:

7225

rdg:

7252

diff:

nom:

7110

rdg:

7137

diff:

BIII

nom:

7188.33

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group BIII

Formula of calculation:

sum(b7,b8,b9) / 3

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7330

rdg:

7351

diff:

nom:

7170

rdg:

7192

diff:

nom:

7065

rdg:

7083

diff:

CIII

nom:

7275.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group CIII

Formula of calculation:

sum(c7,c8,c9,d7,d8,d9) / 6

Statistics of "14"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

nom:

7390

rdg:

7403

diff:

nom:

7205

rdg:

7223

diff:

nom:

7065

rdg:

7082

diff:

nom:

7510

rdg:

7524

diff:

nom:

7320

rdg:

7339

diff:

nom:

7160

rdg:

7180

diff:

STI

nom:

6747.00

rdg:

diff:

Cascade loop

Line insert

Re-measure

Exlclude from analysis

Comment

Averages of group STI

Formula of calculation:

sum(a10,st1,b10,st2,st3) / 5

Statistics of "04"

Evidence must be high for the system to show colored dots at all.

Evidence levels

Low: 3 datasets found and quality is below 18
Medium: 3 datasets found and quality higher than 17
High: 10 datasets found and quality is at least 25 / 3 datasets found and quality is at least 50

The color of the dot itself is based on the spread.

Color codes

Green (reliable): Spread is less than or equal to 2.0. Chances are high that you will get a very similar result.
Yellow (uncertain): Spread is less than or equal to 3.0. Your result might diverge from the expected length change.
Orange (unreliable): Spread is greater than 3.0. Given the data we have, the length change might be something but what expected.

The following table shows statistics acquired by user measurements.

a10

nom:

6825

rdg:

6847

diff:

st1

nom:

6690

rdg:

6712

diff:

b10

nom:

6780

rdg:

6803

diff:

st2

nom:

6700

rdg:

6724

diff:

st3

nom:

6740

rdg:

6766

diff:

Right brake

nom:

7393.64

rdg:

diff:

Re-measure

Comment

Averages of group Br

Formula of calculation:

sum(br1,br2,br3,br4,br5,br6,br7,br8,br9,br10,br11) / 11

br1

nom:

8135

rdg:

8038

diff:

br2

nom:

7825

rdg:

7725

diff:

br3

nom:

7705

rdg:

7610

diff:

br4

nom:

7560

rdg:

7476

diff:

br5

nom:

7410

rdg:

7325

diff:

br6

nom:

7365

rdg:

7281

diff:

br7

nom:

7370

rdg:

7283

diff:

br8

nom:

7155

rdg:

7073

diff:

br9

nom:

6990

rdg:

6912

diff:

br10

nom:

6920

rdg:

6840

diff:

br11

nom:

6895

rdg:

6815

diff:

Help

AoI

The Angle of Incidence diff is shown in the wing view as triangle in millimeters if no ref is selected. Plus means faster. Minus means slower.

ref

The current main/row or suspension point that is set as reference to calculate relative deviations. The referenced object is marked with a border.
You can select/change the ref by:

groups and rows	Using the radio buttons () or click on the grey rows or names of the main lines in the wing at the top.
points	Clicking the white area beneath the suspension point name

nom

The nominal length between suspension point and main riser loop.

rdg

The actual reading from your measurement device. When measuring, rdg is the input field.

diff

The difference between nom and rdg. This value depends on the currently selected ref. If nothing is selected, the actual deviations from rdg to nom are displayed.

colors

Areas marked in red color are further away (the line is longer) than the selected ref. Areas marked in blue color are closer (the line is shorter) than the selected ref.

status

Color coded dots are shown for manual, imported & laser values

Also take a look at the Manual

Continue trimming procedure

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