PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/18-19:58:00
G01     118.4          18.5               17.0 +/-    1.25      38.8 +/-    1.25  0.130 / 0.410
G07     81.8           66.5               13.9 +/-    0.75      15.0 +/-    0.75  0.130 / 0.340
G08     45.8           34.5               11.9 +/-    0.47      19.1 +/-    0.47  0.120 / 0.430
G09     177.4          25.7               16.4 +/-    0.62      31.6 +/-    0.62  0.140 / 0.530
G11     108.0          40.3               16.8 +/-    1.33      24.4 +/-    1.33  0.040 / 0.100
G13     317.5          19.7               12.6 +/-    2.16      27.9 +/-    2.16  0.050 / 0.090
G18     94.0           21.2               15.3 +/-    0.71      32.6 +/-    0.71  0.070 / 0.080
G28     295.0          57.9               14.4 +/-    0.83      16.6 +/-    0.83  0.040 / 0.060
G30     352.8          70.5               13.4 +/-    0.93      14.1 +/-    0.93  0.020 / 0.090