PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/17-21:42:40
G02     49.9           41.2                9.7 +/-    0.52      13.8 +/-    0.52  0.020 / 0.040
G05     80.7           68.2                8.9 +/-    0.55       9.5 +/-    0.55  0.020 / 0.040
G12     184.3          41.9               11.2 +/-    1.47      15.8 +/-    1.47  0.070 / 0.090
G25     255.5          57.6               10.4 +/-    0.48      12.1 +/-    0.48  0.060 / 0.090
G29     320.6          43.4                9.5 +/-    1.05      13.1 +/-    1.05  0.040 / 0.070