PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-14:57:40
G02     70.4           23.2                7.2 +/-    1.09      14.7 +/-    1.09  0.030 / 0.040
G05     47.6           50.9                6.9 +/-    0.79       8.6 +/-    0.79  0.030 / 0.040
G12     183.5          20.8               10.4 +/-    1.04      22.5 +/-    1.04  0.070 / 0.160
G13     119.1          23.6               11.5 +/-    1.24      23.2 +/-    1.24  0.060 / 0.190
G15     155.8          22.8               11.9 +/-    1.56      24.6 +/-    1.56  0.040 / 0.130
G18     222.0          13.2               10.3 +/-    1.32      26.7 +/-    1.32  0.060 / 0.120
G20     219.5          72.2               10.8 +/-    0.83      11.3 +/-    0.83  0.040 / 0.040
G21     283.3          28.4                8.1 +/-    1.06      14.7 +/-    1.06  0.040 / 0.040
G25     220.9          41.3               10.8 +/-    1.60      15.4 +/-    1.60  0.040 / 0.070
G29     346.1          72.2                7.4 +/-    1.00       7.7 +/-    1.00  0.040 / 0.080