PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/11-18:27:20
G02     41.5           48.6               15.7 +/-    0.79      20.1 +/-    0.79  0.040 / 0.040
G05     129.2          68.7               18.1 +/-    0.31      19.3 +/-    0.31  0.050 / 0.050
G12     191.5          56.1               17.8 +/-    0.88      20.9 +/-    0.88  0.030 / 0.040
G20     199.8          37.5               17.8 +/-    1.23      27.0 +/-    1.23  0.030 / 0.050
G25     272.3          59.8               18.0 +/-    0.80      20.5 +/-    0.80  0.060 / 0.110
G29     316.4          39.2               15.1 +/-    1.16      22.2 +/-    1.16  0.060 / 0.130