PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-19:42:30
G10     259.0          34.6               11.5 +/-    1.19      18.4 +/-    1.19  0.040 / 0.050
G13     45.9           23.0                8.1 +/-    1.89      16.6 +/-    1.89  0.040 / 0.050
G15     70.0           54.3               10.4 +/-    0.81      12.5 +/-    0.81  0.090 / 0.190
G20     285.0          57.1               10.1 +/-    2.23      11.7 +/-    2.23  0.110 / 0.230
G21     345.8          65.8               11.3 +/-    0.79      12.2 +/-    0.79  0.040 / 0.050
G26     259.9          11.7                9.8 +/-    5.51      26.5 +/-    5.51  0.030 / 0.040
G27     321.7          12.0                0.6 +/-   27.70       1.5 +/-   27.70  0.370 / 0.290
G29     166.0          40.7               11.2 +/-    0.50      16.1 +/-    0.50  0.100 / 0.220