PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/29-11:12:20
G02     47.9           42.2                4.6 +/-    1.24       6.4 +/-    1.24  0.040 / 0.050
G05     98.3           69.4                6.1 +/-    0.64       6.5 +/-    0.64  0.060 / 0.050
G06     61.4           9.4                 3.0 +/-    5.49       8.5 +/-    5.49  0.030 / 0.040
G12     191.2          51.9                7.9 +/-    0.61       9.8 +/-    0.61  0.040 / 0.030
G20     202.9          39.1                6.9 +/-    1.18      10.1 +/-    1.18  0.070 / 0.080
G21     259.9          11.1               -4.1 +/-   10.94     -11.3 +/-   10.94  0.060 / 0.100
G25     268.0          58.3                7.4 +/-    1.35       8.5 +/-    1.35  0.020 / 0.020
G29     319.8          43.1                4.2 +/-    0.54       5.9 +/-    0.54  0.030 / 0.020