PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-17:12:30
G08     297.5          22.2                6.1 +/-    0.76      12.7 +/-    0.76  0.100 / 0.090
G10     358.1          62.7                7.1 +/-    0.72       7.9 +/-    0.72  0.060 / 0.090
G14     227.1          43.0                8.1 +/-    1.46      11.3 +/-    1.46  0.050 / 0.080
G18     61.0           51.5                8.4 +/-    0.71      10.4 +/-    0.71  0.050 / 0.080
G21     143.6          39.0                9.3 +/-    1.02      13.7 +/-    1.02  0.090 / 0.110
G24     60.5           27.8                7.5 +/-    2.02      13.7 +/-    2.02  0.100 / 0.110
G27     256.9          33.2                7.1 +/-    2.23      11.6 +/-    2.23  0.030 / 0.030
G32     239.5          64.2                8.8 +/-    0.81       9.7 +/-    0.81  0.040 / 0.030