PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-17:12:40
G10     254.8          29.3               11.8 +/-    1.19      20.9 +/-    1.19  0.040 / 0.050
G13     50.3           28.2                7.7 +/-    0.83      14.0 +/-    0.83  0.050 / 0.050
G15     75.4           55.1               10.2 +/-    0.56      12.1 +/-    0.56  0.100 / 0.250
G16     296.4          13.2                9.2 +/-    1.95      23.8 +/-    1.95  0.100 / 0.220
G18     278.8          60.1               11.3 +/-    0.88      12.8 +/-    0.88  0.040 / 0.080
G20     44.9           46.2                8.8 +/-    0.44      11.6 +/-    0.44  0.040 / 0.080
G21     348.0          66.3                8.9 +/-    0.87       9.6 +/-    0.87  0.090 / 0.350
G26     266.9          13.4               10.4 +/-    1.56      26.9 +/-    1.56  0.110 / 0.340
G29     163.5          39.0               13.9 +/-    0.83      20.6 +/-    0.83  0.070 / 0.170