PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/22-17:12:40
G02     29.8           58.6               11.6 +/-    0.44      13.3 +/-    0.44  0.020 / 0.070
G05     151.8          57.5               14.1 +/-    0.96      16.4 +/-    0.96  0.030 / 0.070
G06     52.1           19.2               10.1 +/-    0.62      22.8 +/-    0.62  0.050 / 0.060
G12     205.3          71.1               10.4 +/-    0.44      10.9 +/-    0.44  0.030 / 0.060
G20     198.0          23.7               12.8 +/-    1.83      25.8 +/-    1.83  0.030 / 0.050
G25     298.3          54.1               11.9 +/-    1.15      14.3 +/-    1.15  0.020 / 0.040
G29     307.2          29.3               10.7 +/-    2.00      19.0 +/-    2.00  0.070 / 0.170