PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-07:57:50
G08     293.9          23.1                6.7 +/-    1.63      13.7 +/-    1.63  0.030 / 0.030
G10     9.1            62.8                3.3 +/-    0.79       3.7 +/-    0.79  0.030 / 0.030
G14     229.0          46.7                8.5 +/-    2.70      11.2 +/-    2.70  0.050 / 0.080
G18     317.7          11.0               -5.6 +/-   18.94     -15.4 +/-   18.94  0.040 / 0.090
G20     65.0           52.3                5.5 +/-    1.14       6.7 +/-    1.14  0.080 / 0.100
G21     146.2          39.5                6.3 +/-    1.19       9.3 +/-    1.19  0.080 / 0.100
G24     55.8           25.1                4.6 +/-    2.77       9.0 +/-    2.77  0.090 / 0.120
G27     256.6          32.2                7.9 +/-    2.82      13.3 +/-    2.82  0.070 / 0.110
G32     241.5          62.9                8.5 +/-    0.85       9.4 +/-    0.85  0.110 / 0.130