PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-18:57:40
G02     55.7           36.4               13.7 +/-    1.36      21.2 +/-    1.36  0.060 / 0.080
G05     73.0           68.9               14.3 +/-    1.03      15.2 +/-    1.03  0.040 / 0.100
G12     186.3          37.3               17.9 +/-    0.96      27.3 +/-    0.96  0.040 / 0.060
G13     133.3          12.1               21.8 +/-    2.44      58.1 +/-    2.44  0.040 / 0.070
G20     205.2          55.8               19.0 +/-    0.94      22.5 +/-    0.94  0.120 / 0.440
G21     268.0          15.6               16.8 +/-    1.89      41.2 +/-    1.89  0.130 / 0.440
G25     237.8          54.2               17.3 +/-    0.82      20.7 +/-    0.82  0.030 / 0.030
G29     328.3          54.0               12.5 +/-    0.96      15.0 +/-    0.96  0.030 / 0.040