PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:28:00
G01     60.6786        30.4396         13.4953 +/-  0.5877   23.4187 +/-  0.5877  0.070 / 0.150
G06     180.0552       14.7566         12.7564 +/-  2.5152   31.9173 +/-  2.5152  0.090 / 0.130
G07     141.5394       19.4502         13.9192 +/-  1.3244   31.0411 +/-  1.3244  0.030 / 0.040
G11     47.6787        21.2953         12.2322 +/-  0.8213   26.0818 +/-  0.8213  0.030 / 0.030
G13     265.6669       35.1397         15.1897 +/-  1.0917   24.0435 +/-  1.0917  0.090 / 0.270
G15     298.3391       15.0861         11.3042 +/-  1.8631   28.0589 +/-  1.8631  0.090 / 0.230
G17     263.4539       78.2611         14.7771 +/-  0.6266   15.0598 +/-  0.6266  0.110 / 0.180
G19     232.4500       52.2673         16.1973 +/-  0.9044   19.8852 +/-  0.9044  0.090 / 0.220
G28     34.5228        56.8161         13.4545 +/-  0.8692   15.7385 +/-  0.8692  0.040 / 0.050
G30     142.7681       55.6924         14.7101 +/-  1.3155   17.4021 +/-  1.3155  0.040 / 0.050