PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/17-19:42:40
G02     51.7           40.1                6.9 +/-    0.61      10.1 +/-    0.61  0.030 / 0.030
G05     74.0           67.3                8.5 +/-    0.44       9.2 +/-    0.44  0.030 / 0.030
G12     182.6          37.5               11.1 +/-    0.83      16.9 +/-    0.83  0.250 / 0.490
G13     133.7          10.0               -2.4 +/-   23.37      -6.6 +/-   23.37  0.260 / 0.450
G21     264.8          11.5                9.0 +/-   16.41      24.5 +/-   16.41  0.050 / 0.040
G25     248.4          56.5                9.1 +/-    1.53      10.7 +/-    1.53  0.040 / 0.040
G29     322.4          45.9                8.2 +/-    0.85      10.9 +/-    0.85  0.050 / 0.070