PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-16:42:40
G02     62.3           30.2               12.8 +/-    1.42      22.3 +/-    1.42  0.040 / 0.030
G05     56.5           61.4               13.1 +/-    0.62      14.7 +/-    0.62  0.040 / 0.040
G12     185.3          30.2               13.7 +/-    1.20      23.9 +/-    1.20  0.110 / 0.110
G13     127.5          17.1               17.2 +/-    2.68      40.7 +/-    2.68  0.080 / 0.130
G15     161.7          14.5               16.6 +/-    1.95      41.8 +/-    1.95  0.040 / 0.070
G20     209.8          62.7               17.3 +/-    0.75      19.2 +/-    0.75  0.040 / 0.060
G21     274.4          21.3                9.7 +/-    1.49      20.7 +/-    1.49  0.040 / 0.050
G25     229.9          49.2               17.6 +/-    1.59      22.5 +/-    1.59  0.040 / 0.070
G29     336.0          62.7               11.7 +/-    0.49      13.0 +/-    0.49  0.090 / 0.270