PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/11-18:27:40
G02     41.5           48.6               16.3 +/-    0.43      20.9 +/-    0.43  0.030 / 0.040
G05     129.2          68.7               18.5 +/-    0.68      19.7 +/-    0.68  0.040 / 0.060
G12     191.5          56.1               16.8 +/-    1.63      19.8 +/-    1.63  0.050 / 0.060
G20     199.8          37.5               18.6 +/-    1.59      28.2 +/-    1.59  0.050 / 0.060
G25     272.3          59.8               17.1 +/-    1.01      19.4 +/-    1.01  0.040 / 0.040
G29     316.4          39.2               16.0 +/-    1.19      23.5 +/-    1.19  0.040 / 0.040