PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/30-21:27:30
G02     41.2           49.2                9.7 +/-    1.05      12.3 +/-    1.05  0.060 / 0.050
G05     119.6          69.7               11.7 +/-    0.48      12.4 +/-    0.48  0.060 / 0.060
G12     189.1          52.9               12.5 +/-    0.98      15.3 +/-    0.98  0.030 / 0.050
G20     199.7          40.3               14.1 +/-    0.74      20.4 +/-    0.74  0.030 / 0.040
G25     264.8          60.6               11.9 +/-    0.96      13.4 +/-    0.96  0.050 / 0.050
G29     316.6          39.0               10.0 +/-    1.04      14.8 +/-    1.04  0.040 / 0.040