PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-05:13:00
G05     50.8           11.7                1.1 +/-    2.42       2.9 +/-    2.42  0.050 / 0.050
G10     239.3          17.3                6.3 +/-    2.58      14.7 +/-    2.58  0.050 / 0.050
G13     68.7           34.9                3.1 +/-    1.23       5.0 +/-    1.23  0.160 / 0.210
G15     113.3          55.2                5.0 +/-    0.57       5.9 +/-    0.57  0.110 / 0.200
G16     313.1          11.8               -2.6 +/-   15.61      -7.0 +/-   15.61  0.290 / 0.190
G20     253.2          41.0                5.4 +/-    2.39       7.7 +/-    2.39  0.240 / 0.370
G21     320.3          51.7                3.7 +/-    0.74       4.6 +/-    0.74  0.060 / 0.130
G26     285.3          18.8                3.7 +/-    1.47       8.5 +/-    1.47  0.070 / 0.110
G29     154.6          61.9                3.8 +/-    0.42       4.3 +/-    0.42  0.270 / 0.350