PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/18-19:13:10
G02     42.2           47.9                9.7 +/-    0.60      12.6 +/-    0.60  0.030 / 0.020
G05     108.3          69.4               11.5 +/-    0.65      12.2 +/-    0.65  0.030 / 0.030
G12     184.5          49.8               12.8 +/-    0.67      16.2 +/-    0.67  0.050 / 0.050
G25     271.7          58.9                5.2 +/-    1.47       6.0 +/-    1.47  0.040 / 0.050
G29     315.2          36.5               10.0 +/-    1.46      15.4 +/-    1.46  0.030 / 0.040