PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/18-16:57:40
G02     64.7           28.3                8.5 +/-    0.68      15.4 +/-    0.68  0.030 / 0.030
G05     53.0           58.8                9.0 +/-    1.08      10.4 +/-    1.08  0.030 / 0.030
G12     184.7          27.1               12.2 +/-    1.28      22.8 +/-    1.28  0.030 / 0.050
G13     125.1          19.1               12.3 +/-    1.82      27.6 +/-    1.82  0.040 / 0.040
G15     160.1          16.9               13.5 +/-    1.79      32.2 +/-    1.79  0.100 / 0.200
G20     212.0          66.1               13.5 +/-    0.60      14.6 +/-    0.60  0.080 / 0.230
G21     276.8          23.1               10.2 +/-    1.41      20.8 +/-    1.41  0.050 / 0.130
G25     226.2          46.7               11.1 +/-    1.51      14.6 +/-    1.51  0.050 / 0.100
G29     338.7          65.6                9.2 +/-    0.59      10.0 +/-    0.59  0.130 / 0.400