PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/12-19:57:10
G02     49.8           41.6                8.1 +/-    0.88      11.5 +/-    0.88  0.030 / 0.040
G05     80.3           68.4                7.2 +/-    0.30       7.7 +/-    0.30  0.020 / 0.030
G12     183.2          40.4               10.1 +/-    1.68      14.7 +/-    1.68  0.130 / 0.460
G21     263.0          10.0               -6.5 +/-   16.07     -18.0 +/-   16.07  0.120 / 0.460
G25     253.3          57.5                9.1 +/-    0.79      10.6 +/-    0.79  0.080 / 0.080
G29     320.8          43.8                7.9 +/-    0.85      10.8 +/-    0.85  0.040 / 0.070