Leica SpiderQC v7.1 Quality Report


Program Run: 2020/10/01 02:01:04.42

File Details:


Observation File: mlga275b.20o
GPS Navigation File: mlga275b.20n
GLONASS Navigation File: mlga275b.20g
Galileo Navigation File: mlga275b.20l
BeiDou Navigation File: mlga275b.20f
Quality Testing:  Fail (See below for details) 

Station Details:


Marker Name/Number:  MLGA  13460M001   
Observer/Agency:  IECA  Junta de Andalucia   
Receiver #/Type/Vers:  1834192  LEICA GR50  4.31/7.403 
Antenna #/Type:  23035023  LEIAR20 LEIM   
Antenna Offsets (HEN):  0.077  0.000  0.000 
Approx Position (XYZ):  5103686.767  -395880.369  3792208.996 
Approx Position (plh):  36° 42' 56.14761" N  4° 26' 7.47851" W  115.727m 
Diff. Est-Header:  -0.8 m dX  -5.8 m dY  1.3 m dZ 
Diff. Est-Header:  6.0 m (3600 estimates) 

Session Summary:


Time of first obs:  2020/10/01 01:00:00.00 GPS 
Time of last obs:  2020/10/01 01:59:59.00 GPS 
Session length:  59.98 minutes 
GPS week:  2125, day 4 
Observation interval:  1.00 seconds 
UTC leap seconds:  18 seconds 

Num SVs with obs:  36 
Num SVs with nav:  97 
Total GPS orbits:  31 
Total GLONASS orbits:  40 
Total Galileo orbits:  107 
Total BeiDou orbits:  30 
Total QZSS orbits: 
SVs with obs:  G2 G12 G18 G24 G25 G26 G29 G31 G32 R1 R7 R8 R10 R16 R18 R19 R20 R21 E1 E5 E9 E11 E12 E24 E25 E26 E31 E33 C5 C8 C13 C21 C24 C26 C29 C30  
SVs without obs:  G1 G3 G4 G5 G6 G7 G8 G9 G10 G11 G13 G14 G15 G16 G17 G19 G20 G21 G22 G23 G27 G28 G30 R2 R3 R4 R5 R6 R9 R11 R12 R13 R14 R15 R17 R22 R23 R24 E2 E3 E4 E6 E7 E8 E10 E13 E14 E15 E16 E17 E18 E19 E20 E21 E22 E23 E27 E28 E29 E30 E32 E34 E35 E36 C1 C2 C3 C4 C6 C7 C9 C10 C11 C12 C14 C15 C16 C17 C18 C19 C20 C22 C23 C25 C27 C28 C31 C32 C33 C34 C35 C36 C37 J1 J2 J3 J4 J5 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60  
SVs with nav:  G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G15 G16 G17 G18 G19 G20 G21 G22 G24 G25 G26 G27 G28 G29 G30 G31 G32 R1 R2 R3 R4 R5 R6 R7 R8 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 E19 E21 E24 E25 E26 E27 E30 E31 E33 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C16 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30  
SVs without nav:  G14 G23 R9 E6 E10 E14 E16 E17 E18 E20 E22 E23 E28 E29 E32 E34 E35 E36 C1 C2 C3 C4 C15 C17 C18 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 0 slips, Threshold 50 slips 
Multipath:  Pass  Value 0.17m MP1 / 0.15m MP2 / 0.24m MP5, Threshold 0.5 m 
Data Completeness:  Pass  Value 100.0 %, Threshold 95.0 % 
Navigation Data:  Pass   
     
GLONASS Specific Tests 
Cycle Slips:  Pass  Value 2 slips, Threshold 100 slips 
Multipath:  Pass  Value 0.15m MP1 / 0.16m MP2, Threshold 0.5 m 
Data Completeness:  Pass  Value 97.7 %, Threshold 90.0 % 
Navigation Data:  Pass   
     
Galileo Specific Tests 
Cycle Slips:  Pass  Value 2 slips, Threshold 120 slips 
Multipath:  Pass  Value 0.11m MP1 / 0.23m MP5a / 0.26m MP5b / 0.08m MP5a+b, Threshold 0.5 m 
Data Completeness:  Pass  Value 96.2 %, Threshold 90.0 % 
Navigation Data:  Pass   
     
BeiDou Specific Tests 
Cycle Slips:  Pass  Value 0 slips, Threshold 68 slips 
Multipath:  Pass  Value 0.32m MP1 / 0.47m MP5b, Threshold 0.5 m 
Data Completeness:  Fail  Value 31.8 %, Threshold 90.0 % 
Navigation Data:  Pass   

General Quality Indicators:


Tracking   
Num obs > 0°:  107780 
Num possible obs > 0°:  117723 
Num obs with invalid nav: 
Num obs without nav: 
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°:  2424  (67.3 %) 
Epochs with full data > 15°:  (0.0 %) 

Satellite Geometry 
DOP  Minimum  Maximum  Average 
PDOP  2.3  3.0  2.6 
GDOP  2.9  3.7  3.1 

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 
R20  6.567  1 / 395  23.80° / 25.01°  183.20° / 183.31° 
E11  13.000  2806 / 3586  15.00° / 19.74°  192.32° / 192.94° 
Total:  19.567 (1174 observations) 

Receiver Clock 
Clock Slips > 15°: 
Max RX clock offset:  0.000019 ms (at 2020/10/01 01:48:22.00) 
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 
Tracking information over 0° 
Num obs > 0°:  107780  30531  26193  28816  22240 
Num possible obs > 0°:  117723  30507  28063  35505  23648 
Num obs with invalid nav: 
Num obs without nav: 
Num obs to unhealthy SV: 
             
Tracking over Elevation Mask (15°) 
Num obs > 15°:  73058  25029  16660  20046  11323 
% obs > 15°:   98.4 %  100.0 %  97.7 %  96.3 %  100.0 % 
Num possible obs > 15°:  74234  25029  17055  20827  11323 
Num complete obs > 15°:  65333  25029  16660  20044  3600 
% complete obs > 15°:   88.0 %  100.0 %  97.7 %  96.2 %  31.8 % 
Num obs with WLF change:  
Average # SV per Epoch:  20.3   7.0   4.6   5.6   3.1  
             
Obs L2 : Obs L1  1.791   1.939   1.567  
Obs B2/E5b : Obs B1/E1  0.754   1.000   0.318  
Obs L5/E5a : Obs L1/E1  0.750   0.551   1.000  

Cycle Slips             
Num cycle slips > 15°: 
% slips per complete obs:  0.006 %  0.012 %  0.010 % 
Num complete obs per slip:  16333   8330   10022  
IOD Slips > 15°:  11323  3602  7720 
Outliers > 15°: 
LLI L1/B1/E1 : Obs L1/B1/E1:  0.0000   0.0001   0.0000  
LLI L2 : Obs L2:  0.0000   0.0000  
LLI B2/E5b : Obs B2/E5b:  0.0000   0.0000  
LLI L5 : Obs L5:  0.0000   0.0000  

Multipath             
MP (L1/E1/B1) RMS:  0.152 m  0.167 m  0.149 m  0.113 m  0.316 m 
MP (L2) RMS:  0.154 m  0.149 m  0.163 m 
MP (L5/E5a) RMS:  0.236 m  0.241 m  0.234 m 
MP (E5b/B2) RMS:  0.283 m  0.257 m  0.465 m 
MP (E5a+b) RMS:  0.076 m  0.076 m 

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 78.4 %
78.4 %
78.4 %
78.4 %
L2P 78.4 %
78.4 %
78.4 %
78.4 %
L2S 93.9 %
93.9 %
93.9 %
93.9 %
L2W 100.0 %
100.0 %
100.0 %
100.0 %
L5Q 75.0 %
75.0 %
75.0 %
75.0 %
L7I 31.8 %
31.8 %
31.8 %
31.8 %
L7Q 100.0 %
100.0 %
100.0 %
100.0 %
L8Q 100.0 %
100.0 %
100.0 %
100.0 %

Tracking by satellite > 15°: 
SV Min Elev Max Elev Possible Observations Actual Observations Observations with Invalid Ephemeris Cycle Slips
G2 15.00° 20.15° 1522 1522 (100.0 %)
0 (0.0 %) 0
G12 15.00° 27.30° 2523 2523 (100.0 %)
0 (0.0 %) 0
G18 15.00° 35.98° 2989 2989 (100.0 %)
0 (0.0 %) 0
G25 42.46° 58.60° 3600 3600 (100.0 %)
0 (0.0 %) 0
G26 15.00° 33.83° 3595 3595 (100.0 %)
0 (0.0 %) 0
G29 64.37° 87.28° 3600 3600 (100.0 %)
0 (0.0 %) 0
G31 43.64° 68.45° 3600 3600 (100.0 %)
0 (0.0 %) 0
G32 17.10° 37.38° 3600 3600 (100.0 %)
0 (0.0 %) 0
R10 15.81° 39.86° 3600 3600 (100.0 %)
0 (0.0 %) 0
R16 25.35° 44.16° 3600 3600 (100.0 %)
0 (0.0 %) 0
R18 15.00° 35.00° 2655 2655 (100.0 %)
0 (0.0 %) 0
R19 54.17° 68.85° 3600 3600 (100.0 %)
0 (0.0 %) 0
R20 27.38° 58.43° 3600 3205 (89.0 %)
0 (0.0 %) 2
E1 15.00° 17.03° 582 582 (100.0 %)
0 (0.0 %) 0
E5 15.00° 24.73° 3516 3516 (100.0 %)
0 (0.0 %) 0
E9 15.00° 22.79° 1534 1534 (100.0 %)
0 (0.0 %) 0
E11 19.75° 19.83° 795 14 (1.8 %)
0 (0.0 %) 2
E12 37.31° 60.92° 3600 3600 (100.0 %)
0 (0.0 %) 0
E24 46.49° 61.73° 3600 3600 (100.0 %)
0 (0.0 %) 0
E31 51.72° 61.23° 3600 3600 (100.0 %)
0 (0.0 %) 0
E33 40.83° 47.11° 3600 3600 (100.0 %)
0 (0.0 %) 0
C13 21.75° 22.73° 3600 3600 (100.0 %)
0 (0.0 %) 0
C26 35.24° 57.87° 3600 3600 (100.0 %)
0 (0.0 %) 0
C29 47.91° 66.24° 3600 3600 (100.0 %)
0 (0.0 %) 0
C30 15.00° 17.96° 523 523 (100.0 %)
0 (0.0 %) 0

Missing phase observations by satellite > 15°: 
SV Observations Missing L1C Missing L1I Missing L2C Missing L2P Missing L2S Missing L2W Missing L5Q Missing L7I Missing L7Q Missing L8Q
G2 2.1 %
0.0 %
- - - 100.0 %
0.0 %
100.0 %
- - -
G12 3.5 %
0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G18 4.1 %
0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G25 4.9 %
0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G26 4.9 %
0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G29 4.9 %
0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G31 4.9 %
0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G32 4.9 %
0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
R10 4.9 %
0.0 %
- 100.0 %
100.0 %
- - - - - -
R16 4.9 %
0.0 %
- 0.0 %
0.0 %
- - - - - -
R18 3.6 %
0.0 %
- 0.0 %
0.0 %
- - - - - -
R19 4.9 %
0.0 %
- 0.0 %
0.0 %
- - - - - -
R20 4.4 %
0.0 %
- 0.1 %
0.1 %
- - - - - -
E1 0.8 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E5 4.8 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E9 2.1 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E11 0.0 %
0.0 %
- - - - - 14.3 %
- 14.3 %
14.3 %
E12 4.9 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E24 4.9 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E31 4.9 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E33 4.9 %
0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
C13 4.9 %
- 0.0 %
- - - - - 0.0 %
- -
C26 4.9 %
- 0.0 %
- - - - - 100.0 %
- -
C29 4.9 %
- 0.0 %
- - - - - 100.0 %
- -
C30 0.7 %
- 0.0 %
- - - - - 100.0 %
- -

Missing code observations by satellite > 15°: 
SV Missing C1C Missing C1I Missing C2C Missing C2P Missing C2S Missing C2W Missing C5Q Missing C7I Missing C7Q Missing C8Q
G2 0.0 %
- - - 100.0 %
0.0 %
100.0 %
- - -
G12 0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G18 0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G25 0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G26 0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
G29 0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G31 0.0 %
- - - 0.0 %
0.0 %
100.0 %
- - -
G32 0.0 %
- - - 0.0 %
0.0 %
0.0 %
- - -
R10 0.0 %
- 100.0 %
100.0 %
- - - - - -
R16 0.0 %
- 0.0 %
0.0 %
- - - - - -
R18 0.0 %
- 0.0 %
0.0 %
- - - - - -
R19 0.0 %
- 0.0 %
0.0 %
- - - - - -
R20 0.0 %
- 0.0 %
0.0 %
- - - - - -
E1 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E5 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E9 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E11 0.0 %
- - - - - 14.3 %
- 14.3 %
14.3 %
E12 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E24 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E31 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
E33 0.0 %
- - - - - 0.0 %
- 0.0 %
0.0 %
C13 - 0.0 %
- - - - - 0.0 %
- -
C26 - 0.0 %
- - - - - 100.0 %
- -
C29 - 0.0 %
- - - - - 100.0 %
- -
C30 - 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 Observations
85 - 90 0
0
0
0
0
1.3 %
80 - 85 0
0
0
0
0
1.0 %
75 - 80 0
0
0
0
0
0.8 %
70 - 75 0
0
0
0
0
0.8 %
65 - 70 0
0
0
0
0
5.1 %
60 - 65 0
0
0
0
0
5.2 %
55 - 60 0
0
0
0
0
10.6 %
50 - 55 0
0
0
0
0
9.6 %
45 - 50 0
0
0
0
0
10.0 %
40 - 45 0
0
0
0
0
6.9 %
35 - 40 0
0
0
0
0
5.5 %
30 - 35 0
0
0
0
0
7.0 %
25 - 30 0
2
0
0
0
7.5 %
20 - 25 0
0
0
0
0
15.4 %
15 - 20 0
0
2
0
0
13.3 %
10 - 15 0
0
0
0
0
0.0 %
5 - 10 0
0
0
0
0
0.0 %
0 - 5 0
0
0
0
0
0.0 %

Signal to Noise Ratio by satellite > 15°: 
SV L1/E1/B1 L2 L5/E5a E5b/B2 E5a+b
G2 42.2
40.5
- - -
G12 43.2
43.5
- - -
G18 44.3
47.2
50.6
- -
G25 51.3
52.1
56.1
- -
G26 42.4
46.1
49.9
- -
G29 54.9
55.6
- - -
G31 52.4
51.7
- - -
G32 46.2
46.9
49.5
- -
R10 43.6
- - - -
R16 44.8
44.1
- - -
R18 45.4
45.9
- - -
R19 44.0
50.3
- - -
R20 39.6
49.5
- - -
E1 42.5
- 45.8
46.0
49.0
E5 43.2
- 46.3
47.3
49.9
E9 42.9
- 45.8
47.0
49.5
E11 39.8
- 43.1
42.9
46.1
E12 49.5
- 51.0
52.3
54.8
E24 53.5
- 54.8
55.8
58.4
E31 54.3
- 55.3
56.3
58.9
E33 51.8
- 53.4
54.5
57.0
C13 41.0
- - 42.9
-
C26 51.0
- - - -
C29 53.5
- - - -
C30 42.2
- - - -
Average GPS: 47.1
48.0
51.5
- -
Average GLONASS: 43.5
47.4
- - -
Average Galileo: 47.2
- 49.5
50.3
52.9
Average BeiDou: 46.9
- - 42.9
-
Average QZSS: - - - - -
Average All: 46.4
47.8
50.1
49.4
52.9

Code multipath by satellite > 15°: 
SV Av Elev MP (L1/E1/B1) MP (L2) MP (L5/E5a) MP (E5b/B2) MP (E5a+b)
G2 17.6 ° 0.27 m
0.44 m
- - -
G12 21.2 ° 0.22 m
0.15 m
- - -
G18 25.5 ° 0.21 m
0.13 m
0.23 m
- -
G25 50.5 ° 0.09 m
0.07 m
0.15 m
- -
G26 24.4 ° 0.17 m
0.16 m
0.30 m
- -
G29 75.8 ° 0.05 m
0.06 m
- - -
G31 56.0 ° 0.09 m
0.08 m
- - -
G32 27.2 ° 0.23 m
0.11 m
0.29 m
- -
R10 - - - - - -
R16 34.8 ° 0.16 m
0.20 m
- - -
R18 25.0 ° 0.18 m
0.20 m
- - -
R19 61.5 ° 0.10 m
0.09 m
- - -
R20 42.9 ° 0.16 m
0.15 m
- - -
E1 16.0 ° 0.14 m
- 0.41 m
0.45 m
0.16 m
E5 19.9 ° 0.23 m
- 0.37 m
0.43 m
0.11 m
E9 18.9 ° 0.15 m
- 0.22 m
0.27 m
0.10 m
E11 - - - - - -
E12 49.1 ° 0.07 m
- 0.15 m
0.16 m
0.05 m
E24 54.1 ° 0.06 m
- 0.18 m
0.17 m
0.03 m
E31 56.5 ° 0.05 m
- 0.13 m
0.15 m
0.05 m
E33 44.0 ° 0.08 m
- 0.18 m
0.16 m
0.04 m
C13 22.2 ° 0.32 m
- - 0.47 m
-
C26 - - - - - -
C29 - - - - - -
C30 - - - - - -
Average GPS: - 0.17 m
0.15 m
0.24 m
- -
Average GLONASS: - 0.15 m
0.16 m
- - -
Average Galileo: - 0.11 m
- 0.23 m
0.26 m
0.08 m
Average BeiDou: - 0.32 m
- - 0.47 m
-
Average QZSS: - - - - - -
Average All: - 0.15 m
0.15 m
0.24 m
0.28 m
0.08 m

Code multipath by satellite elevation > 15°: 
Elevation MP (L1/E1/B1) MP (L2) MP (L5/E5a) MP (E5b/B2) MP (E5a+b)
85 - 90 0.04 m
0.05 m
- - -
80 - 85 0.04 m
0.06 m
- - -
75 - 80 0.05 m
0.06 m
- - -
70 - 75 0.08 m
0.05 m
- - -
65 - 70 0.09 m
0.09 m
- - -
60 - 65 0.07 m
0.07 m
0.13 m
0.10 m
0.05 m
55 - 60 0.08 m
0.09 m
0.14 m
0.12 m
0.04 m
50 - 55 0.08 m
0.08 m
0.16 m
0.19 m
0.05 m
45 - 50 0.08 m
0.12 m
0.17 m
0.18 m
0.03 m
40 - 45 0.10 m
0.12 m
0.17 m
0.18 m
0.05 m
35 - 40 0.17 m
0.13 m
0.18 m
0.23 m
0.07 m
30 - 35 0.22 m
0.17 m
0.27 m
- -
25 - 30 0.18 m
0.15 m
0.23 m
- -
20 - 25 0.24 m
0.16 m
0.30 m
0.41 m
0.10 m
15 - 20 0.22 m
0.24 m
0.34 m
0.43 m
0.13 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:


- Updated header information or comments after epoch 2020/10/01 01:59:59.00

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 L1 code and phase measurements with a SNR of at least 0 
(#)  A complete Galileo observation contains non-zero E1, E5a, E5b, E5a+b code and phase measurements with a SNR of at least 0 
(#)  A complete BeiDou observation contains non-zero B1, B2 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 
(-)  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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