PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:43:10
G02     29.9           58.2               13.8 +/-    0.85      15.9 +/-    0.85  0.050 / 0.050
G05     143.7          61.9               16.3 +/-    0.71      18.3 +/-    0.71  0.050 / 0.030
G06     54.9           14.5               10.1 +/-    2.60      25.3 +/-    2.60  0.020 / 0.030
G12     195.0          65.2               15.4 +/-    0.52      16.8 +/-    0.52  0.030 / 0.030
G20     197.7          28.9               21.4 +/-    2.31      38.4 +/-    2.31  0.040 / 0.040
G25     289.7          57.8               15.6 +/-    1.06      18.1 +/-    1.06  0.040 / 0.040
G29     308.8          30.0               14.8 +/-    1.50      25.9 +/-    1.50  0.030 / 0.030