PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/23-21:27:40
G02     53.3           38.4                8.4 +/-    0.47      12.5 +/-    0.47  0.030 / 0.040
G05     70.1           66.1                8.5 +/-    0.44       9.2 +/-    0.44  0.030 / 0.040
G12     183.3          37.1               10.2 +/-    1.17      15.6 +/-    1.17  0.040 / 0.090
G13     133.0          10.8               -3.1 +/-   31.16      -8.5 +/-   31.16  0.030 / 0.070
G21     265.8          12.4               11.1 +/-    3.48      29.4 +/-    3.48  0.050 / 0.080
G25     247.0          55.9                8.8 +/-    0.94      10.4 +/-    0.94  0.050 / 0.070
G29     323.2          47.2                7.6 +/-    1.23       9.9 +/-    1.23  0.060 / 0.060