PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/15-18:13:10
G02     42.6           47.7               16.2 +/-    0.74      21.0 +/-    0.74  0.050 / 0.050
G05     125.5          69.3               18.0 +/-    0.45      19.1 +/-    0.45  0.050 / 0.060
G12     191.2          55.0               17.6 +/-    1.60      21.0 +/-    1.60  0.040 / 0.060
G20     200.1          38.5               20.8 +/-    1.68      31.0 +/-    1.68  0.030 / 0.050
G25     270.2          59.8               18.0 +/-    0.81      20.5 +/-    0.81  0.020 / 0.040
G29     317.3          40.2               16.1 +/-    0.86      23.3 +/-    0.86  0.030 / 0.050