PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-15:12:40
G01     100.9292       28.1094         14.2004 +/-  1.3642   25.8871 +/-  1.3642  0.070 / 0.150
G07     115.8631       50.0969         12.7383 +/-  0.9950   16.0458 +/-  0.9950  0.060 / 0.140
G08     41.6343        13.9050          9.0126 +/-  1.1026   23.0163 +/-  1.1026  0.030 / 0.060
G11     78.5184        39.9255         13.0145 +/-  0.9544   18.9523 +/-  0.9544  0.030 / 0.060
G13     306.4335       30.3428         12.9437 +/-  2.5495   22.5064 +/-  2.5495  0.040 / 0.080
G17     207.7757       46.0370         14.2724 +/-  0.9923   18.9546 +/-  0.9923  0.040 / 0.090
G19     210.4522       19.6861         11.6669 +/-  0.7959   25.8686 +/-  0.7959  0.040 / 0.050
G28     329.1040       61.4320         11.8838 +/-  0.5366   13.3322 +/-  0.5366  0.040 / 0.050
G30     37.6018        79.6593         12.4020 +/-  0.6055   12.5855 +/-  0.6055  0.040 / 0.030