PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/21-04:58:30
G05     49.1           15.2                3.4 +/-    1.32       8.4 +/-    1.32  0.250 / 0.370
G10     236.4          14.0                5.7 +/-    2.64      14.5 +/-    2.64  0.230 / 0.440
G13     74.2           35.6                6.5 +/-    0.72      10.2 +/-    0.72  0.110 / 0.080
G15     121.0          52.9                7.9 +/-    0.38       9.7 +/-    0.38  0.080 / 0.070
G16     316.8          10.4               -7.1 +/-    9.21     -19.6 +/-    9.21  0.210 / 0.330
G20     248.9          37.7                9.4 +/-    1.33      14.1 +/-    1.33  0.170 / 0.390
G21     315.7          48.7                5.5 +/-    0.52       7.0 +/-    0.52  0.090 / 0.400
G25     198.3          10.4                3.2 +/-   13.44       8.9 +/-   13.44  0.120 / 0.340
G26     289.7          19.2                7.5 +/-    1.44      16.8 +/-    1.44  0.050 / 0.110
G29     151.1          67.0                7.3 +/-    0.89       7.8 +/-    0.89  0.050 / 0.130