PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/14-04:13:00
G02     52.4           38.2                4.2 +/-    0.97       6.3 +/-    0.97  0.050 / 0.020
G05     76.1           66.7                4.9 +/-    0.55       5.3 +/-    0.55  0.050 / 0.030
G12     187.6          44.1                5.6 +/-    0.68       7.7 +/-    0.68  0.030 / 0.010
G20     211.9          23.0                5.6 +/-    1.60      11.5 +/-    1.60  0.030 / 0.010
G21     263.3          11.2               -1.8 +/-   11.46      -5.0 +/-   11.46  0.170 / 0.300
G25     256.7          57.1                6.3 +/-    2.05       7.4 +/-    2.05  0.170 / 0.350
G29     321.6          45.0                4.8 +/-    0.48       6.4 +/-    0.48  0.050 / 0.020