PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-17:12:40
G07     344.3          61.7               10.1 +/-    0.42      11.3 +/-    0.42  0.040 / 0.040
G08     97.5           51.5               12.8 +/-    0.71      15.8 +/-    0.71  0.040 / 0.050
G09     194.6          74.5               11.5 +/-    0.71      11.8 +/-    0.71  0.100 / 0.220
G11     144.5          14.3               11.3 +/-    2.52      28.5 +/-    2.52  0.110 / 0.200
G16     46.7           9.9                 8.1 +/-    2.98      22.5 +/-    2.98  0.060 / 0.080
G23     155.6          41.6               12.0 +/-    0.84      17.1 +/-    0.84  0.070 / 0.080
G27     56.4           32.8                8.3 +/-    0.97      13.7 +/-    0.97  0.050 / 0.080
G28     236.0          25.5               13.0 +/-    2.20      25.0 +/-    2.20  0.070 / 0.060
G30     303.0          36.7               10.1 +/-    1.92      15.6 +/-    1.92  0.030 / 0.020