PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-03:27:40
G02     45.1           44.8                4.7 +/-    1.80       6.4 +/-    1.80  0.190 / 0.330
G05     103.2          68.7                6.8 +/-    0.67       7.2 +/-    0.67  0.100 / 0.390
G12     190.5          54.2                6.7 +/-    0.46       8.1 +/-    0.46  0.040 / 0.050
G20     210.2          11.6               -3.3 +/-   14.79      -8.8 +/-   14.79  0.040 / 0.050
G25     275.8          57.8                7.7 +/-    1.90       9.0 +/-    1.90  0.030 / 0.030
G29     315.6          37.2                6.9 +/-    1.10      10.5 +/-    1.10  0.030 / 0.030