PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-08:58:00
G08     278.7          22.0                4.3 +/-    2.27       9.0 +/-    2.27  0.080 / 0.140
G10     40.0           61.2                5.1 +/-    0.87       5.7 +/-    0.87  0.090 / 0.220
G14     245.4          59.0                8.1 +/-    0.84       9.3 +/-    0.84  0.080 / 0.180
G18     316.4          23.7                1.7 +/-    5.72       3.4 +/-    5.72  0.080 / 0.190
G20     83.3           43.9                6.9 +/-    0.77       9.5 +/-    0.77  0.030 / 0.030
G21     151.9          25.2                5.1 +/-    1.76      10.0 +/-    1.76  0.030 / 0.030
G24     45.0           17.0                2.4 +/-    0.89       5.6 +/-    0.89  0.090 / 0.150
G27     242.6          24.1                4.3 +/-    2.08       8.6 +/-    2.08  0.120 / 0.210
G31     181.1          18.3                4.5 +/-    0.93      10.4 +/-    0.93  0.050 / 0.070
G32     274.5          72.5                7.4 +/-    0.66       7.7 +/-    0.66  0.050 / 0.070