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                9.9 +/-    0.86      12.9 +/-    0.86  0.030 / 0.030
G05     107.2          69.2               12.5 +/-    0.78      13.3 +/-    0.78  0.030 / 0.020
G12     186.0          51.2               15.1 +/-    0.58      18.7 +/-    0.58  0.040 / 0.070
G25     273.2          58.5               13.6 +/-    2.91      15.6 +/-    2.91  0.040 / 0.050
G29     315.2          36.4               10.8 +/-    1.46      16.7 +/-    1.46  0.070 / 0.040