PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-18:12:30
G02     295.8          80.7                8.8 +/-    0.56       8.9 +/-    0.56  0.140 / 0.130
G05     170.7          24.8               10.5 +/-    2.60      20.5 +/-    2.60  0.120 / 0.130
G06     40.7           45.6                6.7 +/-    0.99       9.0 +/-    0.99  0.070 / 0.160
G12     317.5          66.2                7.7 +/-    0.61       8.3 +/-    0.61  0.180 / 0.120
G17     83.3           12.2                7.2 +/-    1.21      19.1 +/-    1.21  0.030 / 0.030
G19     71.5           28.8                7.3 +/-    1.06      13.1 +/-    1.06  0.020 / 0.030
G24     234.5          27.1               10.0 +/-    1.88      18.7 +/-    1.88  0.070 / 0.120
G25     317.6          28.1                5.6 +/-    1.80      10.2 +/-    1.80  0.110 / 0.120