PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-04:27:50
G05     50.1           13.1                1.1 +/-    1.88       2.8 +/-    1.88  0.060 / 0.060
G10     238.1          16.0                9.4 +/-    1.92      22.9 +/-    1.92  0.050 / 0.060
G13     70.9           35.2                5.5 +/-    1.11       8.8 +/-    1.11  0.100 / 0.180
G15     116.5          54.3                6.7 +/-    0.58       8.0 +/-    0.58  0.080 / 0.220
G16     314.3          11.5                5.5 +/-    2.12      14.9 +/-    2.12  0.160 / 0.380
G20     251.4          39.6                9.8 +/-    1.05      14.4 +/-    1.05  0.160 / 0.340
G21     318.0          50.2                6.9 +/-    1.26       8.6 +/-    1.26  0.050 / 0.130
G26     286.7          19.1                7.1 +/-    1.22      16.1 +/-    1.22  0.040 / 0.140
G29     153.5          64.5                7.4 +/-    0.71       8.1 +/-    0.71  0.070 / 0.130