PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-16:43:10
G07     323.1          55.2                9.9 +/-    0.75      11.8 +/-    0.75  0.050 / 0.040
G08     118.0          45.8               13.1 +/-    0.61      17.4 +/-    0.61  0.040 / 0.050
G09     267.0          82.5               10.0 +/-    0.70      10.1 +/-    0.70  0.350 / 0.640
G16     43.0           20.9                8.1 +/-    1.93      17.5 +/-    1.93  0.140 / 0.280
G23     149.6          55.8               11.8 +/-    0.43      14.0 +/-    0.43  0.090 / 0.220
G27     71.7           37.3                8.9 +/-    0.76      13.6 +/-    0.76  0.120 / 0.110
G28     227.4          14.6                8.8 +/-    9.71      22.1 +/-    9.71  0.050 / 0.060
G30     292.4          28.1                8.4 +/-    2.24      15.3 +/-    2.24  0.050 / 0.070