PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-05:58:00
G05     48.8           16.2                2.3 +/-    1.45       5.5 +/-    1.45  0.110 / 0.440
G10     235.5          11.3                1.0 +/-   24.44       2.7 +/-   24.44  0.130 / 0.360
G13     77.6           36.7                4.6 +/-    0.62       7.1 +/-    0.62  0.130 / 0.220
G15     124.6          51.7                6.0 +/-    0.75       7.5 +/-    0.75  0.100 / 0.310
G16     314.8          12.2                3.1 +/-    1.81       8.3 +/-    1.81  0.090 / 0.430
G20     274.4          70.9                5.6 +/-    0.65       5.9 +/-    0.65  0.110 / 0.420
G21     312.2          46.4                3.7 +/-    1.59       5.0 +/-    1.59  0.040 / 0.050
G25     200.7          12.1                4.3 +/-    1.35      11.5 +/-    1.35  0.040 / 0.090
G26     287.4          20.9                4.0 +/-    1.97       8.6 +/-    1.97  0.210 / 0.260
G29     154.9          73.8                6.8 +/-    0.54       7.0 +/-    0.54  0.110 / 0.270