PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-07:28:00
G08     307.2          20.2                5.0 +/-    1.04      10.9 +/-    1.04  0.030 / 0.030
G10     340.0          61.1                4.3 +/-    0.57       4.8 +/-    0.57  0.030 / 0.020
G14     219.2          34.1                7.8 +/-    1.62      12.6 +/-    1.62  0.040 / 0.050
G20     43.2           59.0                6.4 +/-    0.79       7.3 +/-    0.79  0.040 / 0.050
G21     137.0          52.9                7.4 +/-    0.82       9.0 +/-    0.82  0.060 / 0.070
G24     69.8           29.2                5.2 +/-    1.58       9.3 +/-    1.58  0.110 / 0.090
G27     273.0          36.8                8.6 +/-    1.74      13.2 +/-    1.74  0.100 / 0.180
G32     225.3          50.5                9.0 +/-    2.63      11.3 +/-    2.63  0.160 / 0.160