PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-17:42:30
G02     237.2          72.8                9.4 +/-    0.94       9.8 +/-    0.94  0.170 / 0.380
G05     175.5          12.6               10.9 +/-    2.19      28.6 +/-    2.19  0.190 / 0.360
G06     41.0           59.0                9.6 +/-    0.39      11.0 +/-    0.39  0.070 / 0.090
G12     321.8          52.1                8.9 +/-    0.70      11.0 +/-    0.70  0.060 / 0.130
G17     72.4           20.2                8.1 +/-    0.72      17.7 +/-    0.72  0.030 / 0.060
G19     58.7           37.1                9.0 +/-    0.86      13.7 +/-    0.86  0.030 / 0.060
G24     247.8          35.4                9.9 +/-    1.16      15.6 +/-    1.16  0.060 / 0.140
G25     316.9          15.9                6.8 +/-    2.36      16.6 +/-    2.36  0.060 / 0.160