PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-17:43:00
G02     43.5           46.8               12.3 +/-    0.49      16.2 +/-    0.49  0.040 / 0.040
G05     121.7          69.7               14.2 +/-    0.49      15.1 +/-    0.49  0.040 / 0.030
G12     191.1          54.3               14.7 +/-    0.44      17.6 +/-    0.44  0.040 / 0.040
G20     200.4          39.1               14.6 +/-    0.71      21.6 +/-    0.71  0.050 / 0.040
G25     269.2          59.6               11.4 +/-    0.91      13.0 +/-    0.91  0.050 / 0.100
G29     318.0          41.2               11.2 +/-    1.14      16.0 +/-    1.14  0.060 / 0.090