PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/22-09:57:50
G02     56.1           34.7                5.2 +/-    1.65       8.3 +/-    1.65  0.030 / 0.030
G05     68.0           65.1                4.3 +/-    0.31       4.7 +/-    0.31  0.040 / 0.030
G12     187.8          40.4                7.5 +/-    0.87      10.9 +/-    0.87  0.040 / 0.060
G13     133.7          11.0                4.0 +/-    6.68      10.8 +/-    6.68  0.050 / 0.060
G20     207.0          49.0                6.2 +/-    1.16       7.9 +/-    1.16  0.040 / 0.060
G21     267.5          16.4                5.8 +/-    1.51      14.0 +/-    1.51  0.050 / 0.050
G25     247.8          55.5                6.2 +/-    1.58       7.4 +/-    1.58  0.360 / 0.430
G29     326.2          51.2                4.2 +/-    1.68       5.2 +/-    1.68  0.260 / 0.290