Leica SpiderQC v7.5 Quality Report


Program Run: 2021/09/20 06:02:24.77

File Details:


Observation File: pozo263f.21o
GPS Navigation File: pozo263f.21n
GLONASS Navigation File: pozo263f.21g
Galileo Navigation File: pozo263f.21l
BeiDou Navigation File: pozo263f.21f
Quality Testing:  Fail (See below for details) 

Station Details:


Marker Name/Number:  POZO  13468M001   
Observer/Agency:  IECA  Junta de Andalucia   
Receiver #/Type/Vers:  1832461  LEICA GR50  4.20/7.300 
Antenna #/Type:  21015005  LEIAR20 LEIM   
Antenna Offsets (HEN):  0.000  0.000  0.000 
Approx Position (XYZ):  4988767.003  -423244.328  3939354.591 
Approx Position (plh):  38° 23' 0.47934" N  4° 50' 57.59105" W  736.051m 
Diff. Est-Header:  1.8 m dX  -4.1 m dY  4.6 m dZ 
Diff. Est-Header:  6.4 m (3600 estimates) 

Session Summary:


Time of first obs:  2021/09/20 05:00:00.00 GPS 
Time of last obs:  2021/09/20 05:59:59.00 GPS 
Session length:  59.98 minutes 
GPS week:  2176, day 1 
Observation interval:  1.00 seconds 
UTC leap seconds:  18 seconds 

Num SVs with obs:  38 
Num SVs with nav:  102 
Total GPS orbits:  32 
Total GLONASS orbits:  45 
Total Galileo orbits:  97 
Total BeiDou orbits:  32 
Total QZSS orbits: 
Total NavIC orbits: 
SVs with obs:  G1 G7 G8 G10 G16 G18 G21 G23 G26 G27 G31 R1 R2 R7 R8 R13 R14 R15 R16 R17 R18 R23 R24 E13 E15 E21 E26 E27 C5 C11 C12 C13 C14 C21 C23 C25 C27 C28  
SVs without obs:  G2 G3 G4 G5 G6 G9 G11 G12 G13 G14 G15 G17 G19 G20 G22 G24 G25 G28 G29 G30 G32 R3 R4 R5 R6 R9 R10 R11 R12 R19 R20 R21 R22 E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E14 E16 E17 E18 E19 E20 E22 E23 E24 E25 E28 E29 E30 E31 E32 E33 E34 E35 E36 C1 C2 C3 C4 C6 C7 C8 C9 C10 C15 C16 C17 C18 C19 C20 C22 C24 C26 C29 C30 C31 C32 C33 C34 C35 C36 C37 J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 I1 I2 I3 I4 I5 I6 I7  
SVs with nav:  G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 G16 G17 G18 G19 G20 G21 G22 G23 G24 G25 G26 G27 G28 G29 G30 G31 G32 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 E1 E2 E3 E4 E5 E7 E8 E9 E11 E12 E13 E15 E18 E19 E21 E24 E25 E26 E27 E30 E31 E33 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C16 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30  
SVs without nav:  E6 E10 E14 E16 E17 E20 E22 E23 E28 E29 E32 E34 E35 E36 C1 C2 C3 C4 C15 C17 C31 C32 C33 C34 C35 C36 C37  
User Disabled SVs:  None 
Meteo epochs: 
Auxiliary epochs: 

Quality Testing:


  Pass/Fail   Details 
General Tests 
Epochs With Data:  Pass  Value 100.0 %, Threshold 99.0 % 
File Format:  Pass   
RX Clock:  Pass   
Other:  Pass   
     
GPS Specific Tests 
Cycle Slips:  Pass  Value 4 slips, Threshold 53 slips 
Multipath:  Pass  Value 0.12m MP1 / 0.10m MP2 / 0.14m MP5, Threshold 0.5 m 
Data Completeness:  Pass  Value 100.0 %, Threshold 95.0 % 
Navigation Data:  Fail   
     
GLONASS Specific Tests 
Cycle Slips:  Pass  Value 0 slips, Threshold 150 slips 
Multipath:  Pass  Value 0.16m MP1 / 0.21m MP2, Threshold 0.5 m 
Data Completeness:  Pass  Value 100.0 %, Threshold 90.0 % 
Navigation Data:  Pass   
     
Galileo Specific Tests 
Cycle Slips:  Pass  Value 1 slips, Threshold 108 slips 
Multipath:  Pass  Value 0.08m MP1 / 0.12m MP5a / 0.13m MP5b / 0.04m MP5a+b, Threshold 0.5 m 
Data Completeness:  Pass  Value 100.0 %, Threshold 90.0 % 
Navigation Data:  Pass   
     
BeiDou Specific Tests 
Cycle Slips:  Pass  Value 0 slips, Threshold 90 slips 
Multipath:  Pass  Value 0.15m MP1 / 0.16m MP2b, Threshold 0.5 m 
Data Completeness:  Pass  Value 100.0 %, Threshold 90.0 % 
Navigation Data:  Fail   

General Quality Indicators:


Tracking   
Num obs > 0°:  115637 
Num possible obs > 0°:  113327 
Num obs with invalid nav: 
Num obs without nav:  4129 
Num obs to unhealthy SV: 
Num obs with WLF change: 
Num complete loss of lock: 

Epochs with < 5 SV > 15°:  (0.0 %) 
Epochs with all SV > 15°:  3599  (100.0 %) 
Epochs with full data > 15°:  3592  (99.8 %) 

Satellite Geometry 
DOP  Minimum  Maximum  Average 
PDOP  2.1  2.4  2.2 
GDOP  2.6  3.0  2.8 

Data Gaps 
Num epochs with data:  3600 
Num epochs without data: 
Data Gaps:  0.00 seconds 

List of Data Gaps (-) 
Duration  Start Time  End Time 
None     

Non-tracked satellites > 15° (^): 
SV  Time (minutes)  Epoch Range  Elevation Range  Azimuth Range 
None   

Receiver Clock 
Clock Slips > 15°: 
Max RX clock offset:  0.000034 ms (at 2021/09/20 05:20:11.00) 
Num of RX clock resets: 
Total clock drift:  +0.000000 ms 
Rate of clock drift:  +0.000 ms/hr 
Av time between resets:  0.000 minute(s) 

Quality Indicators by Satellite System:


  Total  GPS  GLONASS  Galileo  BeiDou  QZSS  NavIC 
Tracking information over 0° 
Num obs > 0°:  115637  34090  33142  18000  30405 
Num possible obs > 0°:  113327  33619  33980  18000  27728 
Num obs with invalid nav: 
Num obs without nav:  4129  529  3600 
Num obs to unhealthy SV: 
               
Tracking over Elevation Mask (15°) 
Num obs > 15°:  84628  26610  24939  18000  15079 
% obs > 15°:   100.0 %  100.0 %  100.0 %  100.0 %  100.0 % 
Num possible obs > 15°:  84629  26611  24939  18000  15079 
Num complete obs > 15°:  84621  26603  24939  18000  15079 
% complete obs > 15°:   100.0 %  100.0 %  100.0 %  100.0 %  100.0 % 
Num obs with WLF change:  
Average # SV per Epoch:  23.5   7.4   6.9   5.0   4.2  
               
Observation ratio w.r.t. L1/E1/B1I: 
Obs L2/B1C:  1.758   1.789   1.725  
Obs E5b/B2I:  0.747   1.000   0.445  
Obs L5/E5a/B2a:  0.874   0.789   1.000  
Obs E5a+b/B2a+b:  1.000   1.000  
Obs L6/E6/B3I/G2a: 
Obs G3: 

Cycle Slips               
Num cycle slips > 15°: 
% slips per complete obs:  0.006 %  0.015 %  0.006 % 
Num complete obs per slip:  16924   6650   18000  
IOD Slips > 15°: 
Outliers > 15°: 
LLI : Obs L1/E1/B1I:  0.0000   0.0001  
LLI : Obs L2/B1C:  0.0000   0.0000  
LLI : Obs E5b/B2I: 
LLI : Obs L5/E5a/B2a: 
LLI : Obs E5a+b/B2a+b: 
LLI : Obs L6/E6/B3I/G2a: 
LLI : Obs G3: 

Multipath               
MP (L1/E1/B1I) RMS:  0.126 m  0.115 m  0.159 m  0.077 m  0.146 m 
MP (L2/B1C) RMS:  0.155 m  0.105 m  0.212 m 
MP (L5/E5a/B2a) RMS:  0.134 m  0.143 m  0.123 m 
MP (E5b/B2I) RMS:  0.135 m  0.126 m  0.158 m 
MP (E5a+b/B2a+b) RMS:  0.040 m  0.040 m 
MP (L6/E6/B3I/G2a) RMS: 
MP (G3) RMS: 

Extended Quality Information:


Tracking by observation type > 15°: 
Type Code Phase SNR Doppler
L1C 100.0 %
100.0 %
100.0 %
100.0 %
L1I 100.0 %
100.0 %
100.0 %
100.0 %
L2C 86.2 %
86.2 %
86.2 %
86.2 %
L2P 86.2 %
86.2 %
86.2 %
86.2 %
L2S 78.9 %
78.9 %
78.9 %
78.9 %
L2W 100.0 %
100.0 %
100.0 %
100.0 %
L5Q 87.4 %
87.4 %
87.4 %
87.4 %
L7I 44.5 %
44.5 %
44.5 %
44.5 %
L7Q 100.0 %
100.0 %
100.0 %
100.0 %
L8Q 100.0 %
100.0 %
100.0 %
100.0 %

Tracking by satellite > 15°: 
SV GPS Min Elev Max Elev Possible Observations Actual Observations Observations with Invalid Ephemeris Cycle Slips
G1 - - 0 0 (-)
529 (-) 0
G8 24.47° 44.35° 3600 3600 (100.0 %)
0 (0.0 %) 0
G10 33.16° 50.32° 3600 3600 (100.0 %)
0 (0.0 %) 0
G16 69.08° 87.44° 3600 3600 (100.0 %)
0 (0.0 %) 0
G18 15.00° 34.85° 2989 2989 (100.0 %)
0 (0.0 %) 2
G21 15.00° 27.67° 2022 2021 (100.0 %)
0 (0.0 %) 2
G23 34.04° 38.59° 3600 3600 (100.0 %)
0 (0.0 %) 0
G26 33.01° 61.39° 3600 3600 (100.0 %)
0 (0.0 %) 0
G27 51.94° 67.69° 3600 3600 (100.0 %)
0 (0.0 %) 0

SV GLONASS Min Elev Max Elev Possible Observations Actual Observations Observations with Invalid Ephemeris Cycle Slips
R1 15.00° 26.02° 2176 2176 (100.0 %)
0 (0.0 %) 0
R8 15.00° 17.09° 2789 2789 (100.0 %)
0 (0.0 %) 0
R13 15.00° 33.97° 2141 2141 (100.0 %)
0 (0.0 %) 0
R14 46.08° 69.84° 3600 3600 (100.0 %)
0 (0.0 %) 0
R15 26.31° 47.79° 3600 3600 (100.0 %)
0 (0.0 %) 0
R17 31.05° 46.82° 3600 3600 (100.0 %)
0 (0.0 %) 0
R23 15.00° 35.82° 3433 3433 (100.0 %)
0 (0.0 %) 0
R24 47.89° 64.38° 3600 3600 (100.0 %)
0 (0.0 %) 0

SV Galileo Min Elev Max Elev Possible Observations Actual Observations Observations with Invalid Ephemeris Cycle Slips
E13 68.23° 82.02° 3600 3600 (100.0 %)
0 (0.0 %) 0
E15 19.92° 38.05° 3600 3600 (100.0 %)
0 (0.0 %) 0
E21 67.92° 72.83° 3600 3600 (100.0 %)
0 (0.0 %) 0
E26 28.45° 44.82° 3600 3600 (100.0 %)
0 (0.0 %) 0
E27 27.99° 51.40° 3600 3600 (100.0 %)
0 (0.0 %) 1

SV BeiDou Min Elev Max Elev Possible Observations Actual Observations Observations with Invalid Ephemeris Cycle Slips
C5 - - 0 0 (-)
3600 (-) 0
C11 28.62° 46.40° 3600 3600 (100.0 %)
0 (0.0 %) 0
C14 15.00° 30.69° 3107 3107 (100.0 %)
0 (0.0 %) 0
C23 32.79° 55.02° 3600 3600 (100.0 %)
0 (0.0 %) 0
C25 15.00° 22.76° 1172 1172 (100.0 %)
0 (0.0 %) 0
C28 40.86° 56.12° 3600 3600 (100.0 %)
0 (0.0 %) 0

Missing phase observations by satellite > 15°: 
SV GPS Observations Missing L1C Missing L2S Missing L2W Missing L5Q
G8 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
G10 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
G16 4.3 %
0.0 %
100.0 %
0.0 %
100.0 %
G18 3.5 %
0.0 %
0.0 %
0.0 %
0.0 %
G21 2.4 %
0.3 %
100.0 %
0.3 %
100.0 %
G23 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
G26 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
G27 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %

SV GLONASS Observations Missing L1C Missing L2C Missing L2P
R1 2.6 %
0.0 %
0.0 %
0.0 %
R8 3.3 %
0.0 %
0.0 %
0.0 %
R13 2.5 %
0.0 %
0.0 %
0.0 %
R14 4.3 %
0.0 %
0.0 %
0.0 %
R15 4.3 %
0.0 %
0.0 %
0.0 %
R17 4.3 %
0.0 %
0.0 %
0.0 %
R23 4.1 %
0.0 %
100.0 %
100.0 %
R24 4.3 %
0.0 %
0.0 %
0.0 %

SV Galileo Observations Missing L1C Missing L5Q Missing L7Q Missing L8Q
E13 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
E15 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
E21 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
E26 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %
E27 4.3 %
0.0 %
0.0 %
0.0 %
0.0 %

SV BeiDou Observations Missing L2I Missing L7I
C11 4.3 %
0.0 %
0.0 %
C14 3.7 %
0.0 %
0.0 %
C23 4.3 %
0.0 %
100.0 %
C25 1.4 %
0.0 %
100.0 %
C28 4.3 %
0.0 %
100.0 %

Missing code observations by satellite > 15°: 
SV GPS Missing C1C Missing C2S Missing C2W Missing C5Q
G8 0.0 %
0.0 %
0.0 %
0.0 %
G10 0.0 %
0.0 %
0.0 %
0.0 %
G16 0.0 %
100.0 %
0.0 %
100.0 %
G18 0.0 %
0.0 %
0.0 %
0.0 %
G21 0.0 %
100.0 %
0.0 %
100.0 %
G23 0.0 %
0.0 %
0.0 %
0.0 %
G26 0.0 %
0.0 %
0.0 %
0.0 %
G27 0.0 %
0.0 %
0.0 %
0.0 %

SV GLONASS Missing C1C Missing C2C Missing C2P
R1 0.0 %
0.0 %
0.0 %
R8 0.0 %
0.0 %
0.0 %
R13 0.0 %
0.0 %
0.0 %
R14 0.0 %
0.0 %
0.0 %
R15 0.0 %
0.0 %
0.0 %
R17 0.0 %
0.0 %
0.0 %
R23 0.0 %
100.0 %
100.0 %
R24 0.0 %
0.0 %
0.0 %

SV Galileo Missing C1C Missing C5Q Missing C7Q Missing C8Q
E13 0.0 %
0.0 %
0.0 %
0.0 %
E15 0.0 %
0.0 %
0.0 %
0.0 %
E21 0.0 %
0.0 %
0.0 %
0.0 %
E26 0.0 %
0.0 %
0.0 %
0.0 %
E27 0.0 %
0.0 %
0.0 %
0.0 %

SV BeiDou Missing C2I Missing C7I
C11 0.0 %
0.0 %
C14 0.0 %
0.0 %
C23 0.0 %
100.0 %
C25 0.0 %
100.0 %
C28 0.0 %
100.0 %

Tracking by satellite elevation > 15°: 
Elevation Cycle Slips GPS Cycle Slips GLONASS Cycle Slips Galileo Cycle Slips BeiDou Cycle Slips QZSS Cycle Slips NavIC Observations
85 - 90 0
0
0
0
0
0
1.2 %
80 - 85 0
0
0
0
0
0
2.8 %
75 - 80 0
0
0
0
0
0
2.1 %
70 - 75 0
0
0
0
0
0
5.1 %
65 - 70 0
0
0
0
0
0
4.0 %
60 - 65 0
0
0
0
0
0
3.8 %
55 - 60 0
0
0
0
0
0
4.3 %
50 - 55 0
0
0
0
0
0
6.2 %
45 - 50 0
0
0
0
0
0
8.3 %
40 - 45 0
0
0
0
0
0
10.7 %
35 - 40 0
0
0
0
0
0
14.0 %
30 - 35 0
0
1
0
0
0
11.2 %
25 - 30 1
0
0
0
0
0
8.5 %
20 - 25 1
0
0
0
0
0
7.7 %
15 - 20 2
0
0
0
0
0
10.0 %
10 - 15 0
0
0
0
0
0
0.0 %
5 - 10 0
0
0
0
0
0
0.0 %
0 - 5 0
0
0
0
0
0
0.0 %

Signal to Noise Ratio by satellite > 15°: 
SV GPS L1 L2 L5
G8 46.1
48.9
52.0
G10 50.5
51.0
53.4
G16 51.2
51.2
-
G18 42.9
46.8
49.5
G21 41.6
39.9
-
G23 47.3
49.7
52.3
G26 49.3
51.6
54.7
G27 52.9
54.7
56.9
Average GPS: 47.7
49.2
53.1

SV GLONASS G1 G2
R1 40.2
37.7
R8 40.1
41.2
R13 34.8
38.3
R14 53.9
50.1
R15 50.5
47.5
R17 49.6
47.8
R23 45.0
-
R24 53.3
49.9
Average GLONASS: 45.9
44.7

SV Galileo E1 E5a E5b E5a+b
E13 54.8
56.0
56.9
59.5
E15 45.7
48.2
48.8
51.6
E21 54.8
55.7
56.8
59.3
E26 48.6
50.1
51.1
53.6
E27 49.1
50.9
51.7
54.4
Average Galileo: 50.6
52.2
53.1
55.7

SV BeiDou B1I B2I
C11 46.0
51.2
C14 40.4
48.0
C23 49.7
-
C25 40.9
-
C28 51.2
-
Average BeiDou: 45.6
49.6

Code multipath by satellite > 15°: 
SV GPS Av Elev MP (L1) MP (L2) MP (L5)
G8 34.4 ° 0.17 m
0.13 m
0.20 m
G10 41.7 ° 0.07 m
0.07 m
0.09 m
G16 78.3 ° 0.04 m
0.04 m
-
G18 24.9 ° 0.21 m
0.18 m
0.27 m
G21 21.3 ° 0.16 m
0.26 m
-
G23 36.3 ° 0.13 m
0.07 m
0.15 m
G26 47.2 ° 0.06 m
0.04 m
0.08 m
G27 59.8 ° 0.07 m
0.05 m
0.07 m
Average GPS: - 0.12 m
0.10 m
0.14 m

SV GLONASS Av Elev MP (G1) MP (G2)
R1 20.5 ° 0.20 m
0.36 m
R8 16.0 ° 0.42 m
0.44 m
R13 24.5 ° 0.17 m
0.14 m
R14 58.0 ° 0.05 m
0.11 m
R15 37.0 ° 0.13 m
0.20 m
R17 38.9 ° 0.09 m
0.13 m
R23 - - -
R24 56.1 ° 0.05 m
0.11 m
Average GLONASS: - 0.16 m
0.21 m

SV Galileo Av Elev MP (E1) MP (E5a) MP (E5b) MP (E5a+b)
E13 75.1 ° 0.03 m
0.05 m
0.05 m
0.01 m
E15 29.0 ° 0.16 m
0.23 m
0.25 m
0.04 m
E21 70.4 ° 0.03 m
0.06 m
0.06 m
0.02 m
E26 36.6 ° 0.08 m
0.17 m
0.17 m
0.06 m
E27 39.7 ° 0.07 m
0.11 m
0.10 m
0.07 m
Average Galileo: - 0.08 m
0.12 m
0.13 m
0.04 m

SV BeiDou Av Elev MP (B1I) MP (B2I)
C11 37.5 ° 0.10 m
0.15 m
C14 22.8 ° 0.21 m
0.16 m
C23 43.9 ° 0.10 m
-
C25 18.9 ° 0.19 m
-
C28 48.5 ° 0.14 m
-
Average BeiDou: - 0.15 m
0.16 m

Code multipath by satellite elevation > 15°: 
Elevation MP (L1/E1/B1I) MP (L2/B1C) MP (L5/E5a/B2a) MP (E5b/B2I) MP (E5a+b/B2a+b) MP (L6/E6/B3I/G2a) MP (G3)
85 - 90 0.05 m
0.04 m
- - - - -
80 - 85 0.04 m
0.04 m
0.05 m
0.03 m
0.01 m
- -
75 - 80 0.03 m
0.04 m
0.04 m
0.05 m
0.01 m
- -
70 - 75 0.04 m
0.06 m
0.06 m
0.06 m
0.02 m
- -
65 - 70 0.05 m
0.08 m
0.05 m
0.07 m
0.02 m
- -
60 - 65 0.05 m
0.09 m
0.06 m
- - - -
55 - 60 0.06 m
0.08 m
0.06 m
- - - -
50 - 55 0.09 m
0.08 m
0.09 m
0.05 m
0.02 m
- -
45 - 50 0.08 m
0.08 m
0.07 m
0.09 m
0.03 m
- -
40 - 45 0.10 m
0.08 m
0.12 m
0.12 m
0.05 m
- -
35 - 40 0.10 m
0.11 m
0.15 m
0.14 m
0.05 m
- -
30 - 35 0.12 m
0.13 m
0.15 m
0.19 m
0.07 m
- -
25 - 30 0.19 m
0.18 m
0.25 m
0.18 m
0.06 m
- -
20 - 25 0.18 m
0.24 m
0.33 m
0.26 m
0.04 m
- -
15 - 20 0.30 m
0.38 m
0.26 m
0.19 m
- - -
10 - 15 - - - - - - -
5 - 10 - - - - - - -
0 - 5 - - - - - - -


Observation File Messages:





GPS Navigation File Messages:




GLONASS Navigation File Messages:




Galileo Navigation File Messages:




BeiDou Navigation File Messages:




General Messages:


- Orbit missing or expired for SV C5 starting 2021/09/20 05:00:00.00.
- Orbit missing or expired for SV G1 starting 2021/09/20 05:51:11.00.
- Updated header information or comments after epoch 2021/09/20 05:59:59.00

Notes:


(*)  Signal strength is mapped between 1 (worst) and 9 (best), 5 is the threshold for good SNR, 0 indicates value is unknown 
(#)  A complete GPS observation contains non-zero L1 code and phase measurements with a SNR of at least 0 
(#)  A complete GLONASS observation contains non-zero G1 code and phase measurements with a SNR of at least 0 
(#)  A complete Galileo observation contains non-zero E1, E5a code and phase measurements with a SNR of at least 0 
(#)  A complete BeiDou observation contains non-zero B1I code and phase measurements with a SNR of at least 0 
(#)  A complete QZSS observation contains non-zero L1 code and phase measurements with a SNR of at least 0 
(#)  A complete NavIC observation contains non-zero L5 code and phase measurements with a SNR of at least 0 
(-)  The minimum duration of a data gap to be reported is 5 seconds 
(^)  A satellite has to be above the elevation mask with no observations recorded for at least 120 seconds to be reported 
The elevation mask is set at 15° 
Abbreviations: Av=Average, IOD=Ionospheric delay, Num=Number, Obs=Observations, MP=Multipath, SV=Satellite vehicle, Elev=Elevation, Nav=Navigation data (ephemeris), WLF=Wavelength factor  
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