[IGSREPORT-27220] Wk 2101 MIT T2 Daily Analysis Report

Tom Herring tah at chandler.mit.edu
Wed Apr 29 00:04:02 PDT 2020


Author: Thomas Herring
MIT GNAAC Combination: RMS comparisons betwen ACs
 
---------------------------------------------------------------------------------------------------------
 OVERALL RMS and Chi fits for week  2101 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    248   0.89   0.48    0.84   0.49    3.26   0.57  | 75   0.97   0.54    0.93   0.54    2.82   0.50 
 SIO    234   1.38   0.53    1.40   0.55    3.85   0.62  | 75   1.38   0.55    1.56   0.62    4.55   0.77 
 GFZ    180   0.93   0.51    0.97   0.51    3.83   0.59  | 75   0.88   0.50    0.97   0.52    3.13   0.50 
 MIT    349   0.79   0.42    0.79   0.44    2.64   0.43  | 75   0.91   0.54    0.84   0.52    3.02   0.56 
 NGS    189   1.07   0.47    1.28   0.60    3.14   0.44  | 75   1.15   0.54    1.37   0.69    3.23   0.48 
 JPL     80   0.91   0.46    0.93   0.49    3.68   0.54  | 20   0.88   0.46    0.87   0.49    3.84   0.59 
 EMR     76   1.22   0.57    1.14   0.59    3.19   0.45  | 38   1.23   0.58    1.11   0.60    3.21   0.46 
 ESA    148   0.81   0.48    0.82   0.49    3.53   0.57  | 47   0.85   0.52    0.85   0.53    3.17   0.52 
 GRG     96   1.41   0.63    0.92   0.48    3.77   0.51  | 29   1.54   0.71    0.84   0.46    3.18   0.45 
---------------------------------------------------------------------------------------------------------
 Center variance scale factors for week  2101 
 CEN      103       104      105      106      107      108     109  |    MEAN  | 
--------------------------------------------------------------------------------
 COF     0.69      0.58     0.68     0.56     0.76     0.54     0.70 |     0.65 |
 SIO     0.89      0.69     1.09     0.54     0.74     0.77     1.05 |     0.82 |
 GFZ    29.95     24.76    31.89    38.91    30.23    31.25    34.05 |    31.58 |
 MIT     0.89      0.87     0.99     0.78     1.06     0.94     1.33 |     0.98 |
 NGS   223.56    315.84   204.33   257.78   202.49   175.98   222.83 |   228.97 |
 JPL     6.79      4.60     5.80     6.02     6.25     4.91     6.61 |     5.86 |
 EMR     4.26      4.12     7.18     4.00     2.95     5.22     3.62 |     4.48 |
 ESA     2.89      2.36     3.12     2.82     2.70     4.03     2.36 |     2.90 |
 GRG    76.35     88.74    73.22    66.16    73.82    71.99    55.40 |    72.24 |
NOTE: COF scale factor multiplied by 10^4
--------------------------------------------------------------------------------
 
 FIT to combined solutions at reference frame sites for week 2101
 # -- Number of reference frame stations used by AC
 CENTER   #       North           East           Up      Frame 
               RMS    Chi     RMS    Chi    RMS     Chi  
               (mm)           (mm)          (mm)         
 COF     45   1.04   0.59    0.98   0.56    4.61   0.81  COMB
 SIO     45   1.46   0.58    1.48   0.57    5.03   0.79  COMB
 GFZ     42   0.90   0.53    1.08   0.58    4.59   0.73  COMB
 MIT     46   0.91   0.56    0.96   0.59    2.87   0.52  COMB
 NGS     39   1.31   0.63    1.44   0.72    3.39   0.50  COMB
 JPL     32   0.92   0.48    0.97   0.53    3.50   0.51  COMB
 EMR     38   1.13   0.56    1.16   0.62    2.79   0.40  COMB
 ESA     40   0.87   0.54    0.89   0.54    4.87   0.79  COMB
 GRG     30   1.35   0.65    0.90   0.50    4.83   0.67  COMB
---------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 0
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    249   1.04   0.54    0.97   0.53    3.10   0.51  |  77   1.11   0.58    0.93   0.52    3.06   0.52
 SIO    242   1.34   0.48    1.44   0.51    3.81   0.57  |  77   1.30   0.48    1.64   0.60    4.12   0.65
 GFZ    178   0.90   0.50    0.97   0.53    3.19   0.50  |  77   0.86   0.49    0.92   0.51    3.09   0.50
 MIT    350   0.75   0.42    0.78   0.44    2.31   0.39  |  77   0.83   0.52    0.82   0.52    2.80   0.55
 NGS    191   1.00   0.44    1.23   0.58    3.28   0.45  |  77   1.17   0.54    1.22   0.62    3.31   0.48
 JPL     80   0.99   0.45    1.07   0.51    4.53   0.60  |  19   1.05   0.50    0.92   0.47    4.82   0.67
 EMR     78   1.24   0.58    1.09   0.58    3.38   0.48  |  39   1.19   0.56    1.00   0.55    3.61   0.52
 ESA    146   0.92   0.54    0.60   0.36    2.83   0.45  |  47   0.97   0.58    0.59   0.36    2.94   0.47
 GRG     95   1.53   0.66    0.96   0.48    3.31   0.43  |  28   1.82   0.81    0.91   0.48    3.30   0.45
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 1
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    250   0.82   0.46    0.78   0.47    3.18   0.57  |  78   0.83   0.48    0.83   0.50    2.68   0.49
 SIO    240   1.15   0.49    1.27   0.55    3.51   0.60  |  78   1.28   0.56    1.36   0.61    3.98   0.73
 GFZ    183   0.82   0.51    0.80   0.48    3.68   0.64  |  78   0.83   0.53    0.83   0.51    2.96   0.53
 MIT    350   0.80   0.45    0.72   0.42    2.40   0.42  |  78   0.89   0.56    0.74   0.49    2.89   0.57
 NGS    190   1.35   0.50    1.63   0.65    3.32   0.38  |  78   1.17   0.45    1.64   0.69    3.15   0.38
 JPL     80   0.76   0.42    0.87   0.51    3.56   0.58  |  21   0.54   0.31    0.96   0.60    3.00   0.51
 EMR     76   1.17   0.57    1.23   0.68    3.12   0.45  |  41   1.17   0.57    1.19   0.67    3.21   0.47
 ESA    149   0.78   0.52    0.71   0.47    3.19   0.56  |  49   0.86   0.57    0.72   0.50    2.81   0.50
 GRG     96   1.70   0.69    1.01   0.47    4.22   0.51  |  29   1.77   0.74    0.97   0.47    4.06   0.51
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 2
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    248   0.96   0.51    0.77   0.44    3.24   0.55  |  77   1.01   0.56    0.79   0.46    2.90   0.51
 SIO    242   1.29   0.46    1.68   0.58    3.72   0.52  |  77   1.29   0.46    1.90   0.66    4.52   0.65
 GFZ    184   0.84   0.46    0.96   0.51    3.82   0.59  |  77   0.75   0.43    0.90   0.49    3.29   0.53
 MIT    350   0.89   0.47    0.75   0.42    2.38   0.39  |  77   1.05   0.61    0.77   0.47    2.77   0.51
 NGS    189   1.06   0.49    1.18   0.59    3.04   0.44  |  77   1.20   0.58    1.27   0.68    3.17   0.49
 JPL     80   0.88   0.45    0.88   0.46    3.46   0.51  |  19   0.81   0.43    0.76   0.42    4.15   0.64
 EMR     79   1.43   0.53    1.30   0.54    3.24   0.35  |  40   1.45   0.54    1.26   0.54    3.30   0.37
 ESA    150   0.69   0.40    0.78   0.45    3.64   0.56  |  47   0.80   0.47    0.75   0.45    2.97   0.46
 GRG     98   1.42   0.64    0.94   0.49    3.75   0.51  |  29   1.58   0.73    0.86   0.48    2.70   0.38
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 3
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    251   0.71   0.43    0.78   0.49    3.13   0.59  |  75   0.85   0.52    0.81   0.52    2.50   0.48
 SIO    241   1.07   0.51    1.06   0.50    3.67   0.70  |  75   1.08   0.53    1.25   0.60    4.64   0.93
 GFZ    182   1.08   0.53    1.30   0.61    4.05   0.56  |  75   1.04   0.53    1.35   0.66    3.12   0.44
 MIT    349   0.76   0.44    0.83   0.50    2.92   0.53  |  75   0.91   0.58    0.92   0.61    3.24   0.65
 NGS    188   1.21   0.51    1.45   0.65    3.08   0.40  |  75   1.31   0.57    1.41   0.67    3.17   0.43
 JPL     80   1.05   0.52    1.01   0.53    3.17   0.46  |  22   1.09   0.56    0.83   0.46    3.42   0.52
 EMR     78   1.23   0.60    1.10   0.60    3.12   0.45  |  39   1.24   0.61    1.10   0.62    3.02   0.44
 ESA    149   0.82   0.49    0.95   0.58    3.82   0.62  |  48   0.88   0.54    1.02   0.64    3.73   0.61
 GRG     97   1.46   0.69    0.76   0.41    3.66   0.52  |  30   1.57   0.76    0.70   0.41    3.45   0.51
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 4
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    247   0.94   0.48    0.94   0.50    3.32   0.53  |  73   1.04   0.54    1.16   0.63    2.54   0.42
 SIO    220   1.67   0.67    1.52   0.63    4.08   0.68  |  73   1.40   0.59    1.60   0.67    4.82   0.84
 GFZ    179   0.95   0.53    0.84   0.46    4.06   0.64  |  73   0.89   0.52    0.85   0.47    3.37   0.55
 MIT    349   0.74   0.38    0.84   0.44    2.87   0.45  |  73   0.93   0.53    0.91   0.53    3.41   0.60
 NGS    187   0.98   0.47    1.06   0.54    3.21   0.47  |  73   1.13   0.57    1.15   0.62    3.23   0.51
 JPL     80   0.86   0.43    0.90   0.47    4.04   0.57  |  17   0.72   0.37    0.78   0.44    4.38   0.66
 EMR     77   1.00   0.57    0.91   0.58    2.83   0.48  |  39   1.06   0.61    0.90   0.59    2.92   0.51
 ESA    149   0.77   0.47    0.80   0.50    3.48   0.58  |  46   0.83   0.52    0.91   0.59    2.78   0.47
 GRG     97   1.22   0.54    0.98   0.50    4.16   0.55  |  28   1.35   0.62    0.92   0.50    3.26   0.46
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 5
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    247   0.75   0.45    0.79   0.50    3.17   0.60  |  73   0.81   0.49    0.96   0.62    2.49   0.48
 SIO    235   1.52   0.57    1.51   0.59    3.90   0.63  |  73   1.63   0.65    1.80   0.72    4.80   0.82
 GFZ    178   1.03   0.56    0.87   0.45    3.91   0.60  |  73   0.99   0.56    0.88   0.47    2.99   0.47
 MIT    350   0.76   0.41    0.78   0.43    2.67   0.44  |  73   0.80   0.48    0.95   0.58    2.93   0.55
 NGS    187   0.93   0.48    1.00   0.55    3.00   0.48  |  73   1.03   0.55    1.18   0.70    3.31   0.56
 JPL     80   0.86   0.48    0.76   0.44    3.30   0.53  |  22   0.85   0.49    0.71   0.44    3.41   0.58
 EMR     76   1.30   0.56    1.39   0.66    3.43   0.44  |  36   1.27   0.55    1.37   0.69    3.25   0.42
 ESA    150   0.98   0.50    1.05   0.53    3.93   0.53  |  45   0.89   0.46    1.10   0.58    3.68   0.51
 GRG     96   1.34   0.60    0.98   0.51    3.58   0.48  |  30   1.40   0.65    0.83   0.46    2.73   0.38
---------------------------------------------------------------------------------------------------------
 
RESULTS FOR GPS WEEK 2101 DOW 6
 
 CENTER   #       North           East           Up      | NC       North           East           Up
               RMS    Chi     RMS    Chi    RMS     Chi  |        RMS    Chi     RMS    Chi    RMS     Chi
               (mm)           (mm)          (mm)         |        (mm)           (mm)          (mm)
 COF    248   0.95   0.51    0.86   0.48    3.63   0.60  |  76   1.07   0.59    0.96   0.55    3.43   0.59
 SIO    218   1.55   0.54    1.26   0.44    4.29   0.60  |  76   1.58   0.57    1.22   0.44    4.93   0.73
 GFZ    177   0.87   0.46    0.95   0.48    4.01   0.58  |  76   0.80   0.44    0.93   0.49    3.05   0.46
 MIT    349   0.81   0.37    0.85   0.40    2.83   0.40  |  76   0.92   0.48    0.79   0.42    3.09   0.50
 NGS    191   0.89   0.40    1.28   0.62    3.02   0.42  |  76   1.01   0.48    1.60   0.83    3.27   0.48
 JPL     80   0.95   0.45    0.96   0.48    3.51   0.48  |  22   0.94   0.47    1.06   0.57    3.65   0.54
 EMR     74   1.11   0.58    0.85   0.49    3.16   0.48  |  38   1.19   0.64    0.84   0.50    3.10   0.49
 ESA    149   0.66   0.44    0.73   0.49    3.65   0.65  |  50   0.74   0.50    0.73   0.51    3.18   0.58
 GRG     95   1.12   0.58    0.81   0.48    3.58   0.56  |  31   1.21   0.65    0.66   0.42    2.52   0.42
---------------------------------------------------------------------------------------------------------
 
CENTER SINEX ERRORS: 
 CNT  Site Type of Error           Used values                       IGS.SNX values
 COM  ALGO Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  ALGO Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  CEDU Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  CEDU Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  CHUM Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  CHUM Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  DUBO Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  DUBO Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  GOLD Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  GOLD Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  HOB2 Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  HOB2 Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  JPLM Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004131200_gfz1.gls
 COM  JPLM Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004131200_gfz1.gls
 COM  KIRU Eccentricity: Used          0.0000   0.0000   0.1120 Real   0.0000   0.0000   0.0620  m ../glbs/h2004121200_gfz0.gls
 COM  MORP Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  MORP Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  NRC1 Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  NRC1 Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  PRDS Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  PRDS Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  SPT0 Real JNSCR_C146-22-1 OSOD dL1  -0.0008  -0.0011   0.0894  dL2   0.0000  -0.0000   0.1194  m ../glbs/h2004121200_gfz0.gls
 COM  SPT0 Used JNSCR_C146-22-1 OSOD dL1  -0.0013  -0.0015   0.0891  dL2  -0.0007   0.0004   0.1196  m ../glbs/h2004121200_gfz0.gls
 COM  STJO Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  STJO Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  TIDB Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  TIDB Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  WHIT Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  WHIT Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  YAR2 Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  YAR2 Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  YELL Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  YELL Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 COM  ZAMB Real AOAD/M_T        NONE dL1   0.0007  -0.0005   0.0918  dL2  -0.0003  -0.0007   0.1203  m ../glbs/h2004121200_gfz0.gls
 COM  ZAMB Used AOAD/M_T        NONE dL1   0.0006  -0.0005   0.0912  dL2  -0.0001  -0.0006   0.1201  m ../glbs/h2004121200_gfz0.gls
 ESA  KIRU Eccentricity: Used          0.0000   0.0000   0.1120 Real   0.0000   0.0000   0.0620  m ../glbs/h2004121200_esa0.gls
 GRG  KIRU Eccentricity: Used          0.0000   0.0000   0.1120 Real   0.0000   0.0000   0.0620  m ../glbs/h2004121200_grg0.gls
 IGS  KIRU Eccentricity: Used          0.0000   0.0000   0.1120 Real   0.0000   0.0000   0.0620  m ../glbs/h2004121200_cof0.gls
 JPL  DUMG Eccentricity: Used          0.0000   0.0000   0.4270 Real  -0.0005   0.0003   0.4278  m ../glbs/h2004121200_jpl0.gls
 MIT  MDO1 Real JAVRINGANT_DM   SCIS dL1   0.0005   0.0008   0.0854  dL2   0.0002   0.0001   0.1150  m ../glbs/h2004151200_mit3.gls
 MIT  MDO1 Used TPSCR.G3        SCIS dL1  -0.0002   0.0003   0.0842  dL2   0.0005  -0.0001   0.1203  m ../glbs/h2004151200_mit3.gls
 MIT  MOBK Real JPSREGANT_SD_E1 NONE dL1  -0.0007  -0.0002   0.0911  dL2   0.0000  -0.0000   0.1154  m ../glbs/h2004161200_mit4.gls
 MIT  MOBK Used JPSREGANT_SD_E  NONE dL1  -0.0004  -0.0003   0.0913  dL2   0.0003  -0.0001   0.1189  m ../glbs/h2004161200_mit4.gls
 MIT  STJ3 Eccentricity: Used          0.0000   0.0000   0.0525 Real   0.0000   0.0000   0.0542  m ../glbs/h2004151200_mit3.gls
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