PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-04:27:50
G08     262.8          16.2                9.6 +/-    1.68      23.3 +/-    1.68  0.190 / 0.360
G10     69.6           56.3                8.0 +/-    1.48       9.4 +/-    1.48  0.170 / 0.550
G11     308.1          20.0                9.0 +/-    1.33      19.7 +/-    1.33  0.030 / 0.050
G14     274.2          66.8                7.6 +/-    0.62       8.2 +/-    0.62  0.040 / 0.050
G18     309.7          35.4                7.6 +/-    1.12      12.0 +/-    1.12  0.140 / 0.360
G20     90.2           49.5               10.7 +/-    0.56      13.6 +/-    0.56  0.200 / 0.300
G21     155.6          11.8                5.9 +/-    1.51      15.8 +/-    1.51  0.110 / 0.280
G27     228.5          12.8                9.8 +/-   16.75      25.8 +/-   16.75  0.130 / 0.390
G31     175.6          37.1               11.6 +/-    1.47      17.7 +/-    1.47  0.030 / 0.040
G32     358.8          70.8                8.5 +/-    0.74       9.0 +/-    0.74  0.030 / 0.040