PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-13:28:00
G01     227.6          19.1                6.3 +/-    2.30      14.2 +/-    2.30  0.180 / 0.340
G03     284.5          71.0                7.0 +/-    0.58       7.4 +/-    0.58  0.320 / 0.290
G14     84.2           25.2                8.8 +/-    3.37      17.1 +/-    3.37  0.130 / 0.180
G16     152.9          39.9                7.9 +/-    1.56      11.5 +/-    1.56  0.120 / 0.230
G22     208.2          70.8                9.0 +/-    0.97       9.4 +/-    0.97  0.140 / 0.220
G23     305.3          35.6                8.4 +/-    1.53      13.1 +/-    1.53  0.130 / 0.180
G26     107.4          54.0                8.9 +/-    0.99      10.7 +/-    0.99  0.040 / 0.030
G31     44.2           35.3                6.9 +/-    1.57      10.9 +/-    1.57  0.040 / 0.030
G32     95.3           11.9                8.1 +/-    1.84      21.7 +/-    1.84  0.040 / 0.040