PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-01:27:50
G02     45.5           44.6                9.6 +/-    1.47      13.0 +/-    1.47  0.040 / 0.040
G05     100.0          68.9               10.8 +/-    0.77      11.5 +/-    0.77  0.050 / 0.050
G12     188.8          52.1               13.0 +/-    0.47      16.0 +/-    0.47  0.030 / 0.030
G25     272.7          58.1               12.2 +/-    1.48      14.0 +/-    1.48  0.030 / 0.030
G29     316.1          37.7               10.3 +/-    0.83      15.6 +/-    0.83  0.050 / 0.040