PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:27:30
G02     34.4           54.7               10.0 +/-    0.86      11.9 +/-    0.86  0.040 / 0.040
G05     145.4          62.1               12.1 +/-    0.40      13.5 +/-    0.40  0.040 / 0.040
G06     54.7           15.5                9.1 +/-    2.10      22.3 +/-    2.10  0.030 / 0.030
G12     198.3          65.9               10.2 +/-    0.47      11.0 +/-    0.47  0.030 / 0.030
G20     198.5          28.5               13.3 +/-    1.35      24.0 +/-    1.35  0.040 / 0.040
G25     290.4          57.0               11.5 +/-    1.39      13.5 +/-    1.39  0.030 / 0.040
G29     310.7          32.9                7.7 +/-    0.71      12.6 +/-    0.71  0.040 / 0.030