PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-16:13:10
G07     312.5          51.1                9.3 +/-    1.11      11.6 +/-    1.11  0.100 / 0.190
G08     127.7          40.2               11.7 +/-    0.82      17.0 +/-    0.82  0.110 / 0.160
G09     307.2          76.7                9.3 +/-    1.02       9.5 +/-    1.02  0.030 / 0.060
G16     42.0           27.9                6.2 +/-    1.43      11.4 +/-    1.43  0.040 / 0.070
G23     143.5          64.4               11.2 +/-    0.84      12.3 +/-    0.84  0.060 / 0.130
G27     82.4           37.7                9.1 +/-    0.53      13.7 +/-    0.53  0.060 / 0.150
G30     286.0          23.2                9.7 +/-    1.94      19.7 +/-    1.94  0.050 / 0.080