PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-03:57:40
G02     54.3           36.6                2.5 +/-    0.97       3.9 +/-    0.97  0.160 / 0.250
G05     70.4           65.4                3.2 +/-    0.45       3.5 +/-    0.45  0.300 / 0.230
G12     186.9          41.4                4.4 +/-    1.16       6.3 +/-    1.16  0.040 / 0.070
G13     134.4          9.9                -5.9 +/-   10.78     -16.4 +/-   10.78  0.050 / 0.050
G20     213.3          22.6                5.3 +/-    1.75      10.8 +/-    1.75  0.190 / 0.370
G21     265.2          12.6                3.1 +/-    9.41       8.0 +/-    9.41  0.310 / 0.420
G25     251.8          56.2                4.5 +/-    2.08       5.3 +/-    2.08  0.030 / 0.030
G29     323.1          47.1                3.8 +/-    0.83       5.0 +/-    0.83  0.030 / 0.040