PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-15:42:40
G07     314.5          50.0               13.7 +/-    0.90      17.3 +/-    0.90  0.040 / 0.060
G08     122.9          45.4               16.4 +/-    1.04      22.0 +/-    1.04  0.050 / 0.050
G09     260.0          83.0               13.8 +/-    1.91      13.9 +/-    1.91  0.040 / 0.060
G16     43.3           16.5                9.3 +/-    1.62      22.3 +/-    1.62  0.040 / 0.060
G23     148.0          51.6               16.2 +/-    0.60      20.1 +/-    0.60  0.140 / 0.440
G27     69.8           36.5               11.7 +/-    0.85      18.0 +/-    0.85  0.130 / 0.350
G28     228.1          18.7               13.3 +/-    3.13      30.1 +/-    3.13  0.080 / 0.170
G30     291.7          27.0               14.2 +/-    2.52      26.6 +/-    2.52  0.060 / 0.170