PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-16:43:20
G07     323.1          55.2                9.1 +/-    0.93      10.8 +/-    0.93  0.210 / 0.480
G08     118.0          45.8               12.1 +/-    0.77      16.2 +/-    0.77  0.220 / 0.450
G09     267.0          82.5                9.8 +/-    0.93       9.9 +/-    0.93  0.040 / 0.050
G16     43.0           20.9                7.2 +/-    1.68      15.5 +/-    1.68  0.050 / 0.050
G23     149.6          55.8               12.3 +/-    0.75      14.5 +/-    0.75  0.090 / 0.170
G27     71.7           37.3                8.6 +/-    0.48      13.1 +/-    0.48  0.090 / 0.130
G28     227.4          14.6               10.9 +/-    3.60      27.3 +/-    3.60  0.050 / 0.060
G30     292.4          28.1                7.4 +/-    1.20      13.5 +/-    1.20  0.060 / 0.070