PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/28-11:12:30
G02     46.4           43.5                4.6 +/-    1.89       6.3 +/-    1.89  0.030 / 0.020
G05     104.3          69.3                5.7 +/-    1.07       6.1 +/-    1.07  0.030 / 0.020
G06     60.2           10.7                4.4 +/-    1.60      12.0 +/-    1.60  0.120 / 0.110
G12     192.0          54.0                6.5 +/-    0.87       7.9 +/-    0.87  0.090 / 0.100
G20     202.3          37.2                5.6 +/-    1.19       8.5 +/-    1.19  0.040 / 0.040
G25     271.9          58.3                3.8 +/-    2.66       4.3 +/-    2.66  0.040 / 0.040
G29     318.5          41.6                4.0 +/-    0.96       5.6 +/-    0.96  0.190 / 0.210