PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-04:12:40
G02     65.2           27.4                2.9 +/-    1.00       5.5 +/-    1.00  0.070 / 0.130
G05     50.8           54.0                4.7 +/-    0.64       5.6 +/-    0.64  0.210 / 0.130
G12     183.9          26.5                4.3 +/-    1.32       8.0 +/-    1.32  0.090 / 0.130
G13     123.7          19.3                6.1 +/-    2.12      13.7 +/-    2.12  0.110 / 0.130
G15     160.0          17.2                6.2 +/-    1.68      14.5 +/-    1.68  0.030 / 0.040
G20     219.8          33.6                7.8 +/-    1.79      12.7 +/-    1.79  0.030 / 0.050
G21     276.2          21.0                6.4 +/-    2.42      13.7 +/-    2.42  0.240 / 0.310
G25     230.0          47.5                5.5 +/-    2.98       7.1 +/-    2.98  0.150 / 0.390
G29     332.0          60.2                3.6 +/-    0.30       4.0 +/-    0.30  0.070 / 0.100