PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-21:58:00
G02     81.3           16.5               12.8 +/-    2.68      30.7 +/-    2.68  0.120 / 0.210
G05     44.4           39.2               12.6 +/-    0.76      18.6 +/-    0.76  0.130 / 0.200
G13     103.4          32.7               17.3 +/-    0.74      28.7 +/-    0.74  0.060 / 0.110
G15     148.0          35.3               21.0 +/-    1.28      33.2 +/-    1.28  0.070 / 0.100
G18     229.8          24.7               26.1 +/-    1.45      51.4 +/-    1.45  0.150 / 0.310
G20     340.4          85.1               14.8 +/-    0.90      14.9 +/-    0.90  0.160 / 0.240
G21     294.7          34.7               16.3 +/-    2.42      26.0 +/-    2.42  0.110 / 0.150
G25     206.3          25.3               24.4 +/-    1.33      47.3 +/-    1.33  0.110 / 0.160
G26     309.5          16.4               13.3 +/-    2.97      32.0 +/-    2.97  0.030 / 0.020
G29     27.5           85.5               18.8 +/-    0.70      18.9 +/-    0.70  0.030 / 0.020