PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-21:13:00
G10     285.1          47.4               10.5 +/-    2.73      13.7 +/-    2.73  0.030 / 0.040
G15     50.0           41.0                8.0 +/-    0.91      11.4 +/-    0.91  0.040 / 0.040
G20     330.5          64.9               10.0 +/-    0.63      10.9 +/-    0.63  0.090 / 0.110
G21     59.9           77.1               10.3 +/-    0.45      10.6 +/-    0.45  0.070 / 0.090
G24     104.0          22.5                9.5 +/-    1.21      19.6 +/-    1.21  0.100 / 0.160
G27     309.9          28.7                9.5 +/-    0.87      17.2 +/-    0.87  0.090 / 0.170
G29     168.7          16.3               12.9 +/-    1.83      31.2 +/-    1.83  0.140 / 0.110
G32     207.1          24.2               15.1 +/-    1.79      30.0 +/-    1.79  0.160 / 0.080