PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-08:12:50
G08     286.7          23.1                8.2 +/-    1.33      16.7 +/-    1.33  0.050 / 0.110
G10     24.1           62.5                4.7 +/-    0.48       5.3 +/-    0.48  0.050 / 0.120
G14     235.8          52.8                7.7 +/-    0.96       9.4 +/-    0.96  0.090 / 0.140
G18     317.6          17.0                5.6 +/-    2.78      13.3 +/-    2.78  0.110 / 0.150
G20     74.2           48.5                5.3 +/-    0.44       6.8 +/-    0.44  0.040 / 0.030
G21     149.3          32.8                7.0 +/-    1.17      11.5 +/-    1.17  0.050 / 0.030
G24     50.1           21.6                2.5 +/-    1.53       5.3 +/-    1.53  0.050 / 0.090
G27     249.4          28.6                6.7 +/-    1.22      12.0 +/-    1.22  0.060 / 0.090
G31     182.7          11.6                3.3 +/-   10.96       8.8 +/-   10.96  0.110 / 0.180
G32     254.5          68.2                8.0 +/-    0.66       8.5 +/-    0.66  0.110 / 0.210