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         12.4920 +/-  0.9751   22.7728 +/-  0.9751  0.040 / 0.040
G07     115.8631       50.0969         13.6069 +/-  0.5275   17.1399 +/-  0.5275  0.050 / 0.040
G08     41.6343        13.9050         10.1136 +/-  3.1784   25.8281 +/-  3.1784  0.080 / 0.150
G11     78.5184        39.9255         12.0969 +/-  0.7873   17.6161 +/-  0.7873  0.070 / 0.130
G13     306.4335       30.3428         12.1106 +/-  1.5900   21.0578 +/-  1.5900  0.050 / 0.120
G17     207.7757       46.0370         11.5750 +/-  0.8378   15.3722 +/-  0.8378  0.060 / 0.110
G19     210.4522       19.6861         13.3345 +/-  1.1923   29.5660 +/-  1.1923  0.040 / 0.020
G28     329.1040       61.4320         11.3599 +/-  0.4411   12.7444 +/-  0.4411  0.040 / 0.030
G30     37.6018        79.6593         11.7227 +/-  0.5420   11.8961 +/-  0.5420  0.030 / 0.050