PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/19-19:42:40
G07     309.4          47.5               13.4 +/-    0.70      17.5 +/-    0.70  0.040 / 0.040
G08     130.0          41.9               16.4 +/-    0.80      23.2 +/-    0.80  0.040 / 0.050
G09     295.1          79.9               11.9 +/-    0.47      12.1 +/-    0.47  0.490 / 0.580
G16     42.3           21.6                9.6 +/-    2.71      20.3 +/-    2.71  0.580 / 0.630
G23     145.5          57.8               15.4 +/-    0.63      17.9 +/-    0.63  0.140 / 0.310
G27     74.9           36.9               13.8 +/-    0.62      21.2 +/-    0.62  0.150 / 0.280
G28     225.6          15.4               20.5 +/-    2.52      50.6 +/-    2.52  0.040 / 0.090
G30     289.2          26.1               12.8 +/-    1.32      24.4 +/-    1.32  0.040 / 0.060