PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-09:27:50
G08     274.1          20.9                5.4 +/-    1.49      11.6 +/-    1.49  0.130 / 0.250
G10     48.7           60.1                6.2 +/-    1.27       7.1 +/-    1.27  0.110 / 0.230
G14     252.4          62.3                4.8 +/-    0.85       5.3 +/-    0.85  0.050 / 0.060
G18     315.1          27.6                2.6 +/-    1.82       4.7 +/-    1.82  0.050 / 0.050
G20     88.1           41.2                5.6 +/-    0.95       8.0 +/-    0.95  0.030 / 0.030
G21     153.0          20.8                4.0 +/-    2.15       8.6 +/-    2.15  0.030 / 0.020
G24     42.5           14.0                3.1 +/-    3.55       7.9 +/-    3.55  0.030 / 0.030
G27     239.0          21.3                5.2 +/-    3.40      11.2 +/-    3.40  0.030 / 0.020
G31     180.3          22.3                4.6 +/-    2.57       9.7 +/-    2.57  0.120 / 0.130
G32     289.3          73.9                5.8 +/-    0.78       6.1 +/-    0.78  0.110 / 0.300