PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-20:58:10
G02     3.4            72.5               11.6 +/-    0.62      12.1 +/-    0.62  0.070 / 0.090
G05     161.4          43.7               13.9 +/-    0.55      19.1 +/-    0.55  0.080 / 0.150
G06     46.1           29.0                7.2 +/-    1.24      12.8 +/-    1.24  0.170 / 0.220
G12     255.3          80.4                9.0 +/-    0.75       9.1 +/-    0.75  0.210 / 0.290
G19     87.2           18.2               -7.0 +/-   58.44     -16.1 +/-   58.44  0.130 / 0.350
G20     197.0          11.4                7.7 +/-   31.99      20.9 +/-   31.99  0.090 / 0.180
G24     221.0          14.9               12.1 +/-    2.24      30.1 +/-    2.24  0.030 / 0.030
G25     311.7          44.4                9.8 +/-    2.57      13.3 +/-    2.57  0.030 / 0.030
G29     295.7          17.3                7.9 +/-    1.97      18.6 +/-    1.97  0.030 / 0.060