PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-21:12:00
G02     42.8           47.2                9.3 +/-    0.52      12.2 +/-    0.52  0.030 / 0.040
G05     107.2          69.2               11.2 +/-    0.75      11.9 +/-    0.75  0.030 / 0.030
G12     186.0          51.2               12.3 +/-    1.77      15.3 +/-    1.77  0.060 / 0.070
G25     273.2          58.5               11.7 +/-    1.00      13.5 +/-    1.00  0.040 / 0.070
G29     315.2          36.4               10.4 +/-    1.46      16.1 +/-    1.46  0.070 / 0.050