PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-15:27:40
G01     93.2317        30.7491         13.5954 +/-  0.8197   23.4428 +/-  0.8197  0.050 / 0.140
G07     123.1638       44.2803         13.9651 +/-  1.0817   19.0140 +/-  1.0817  0.060 / 0.150
G11     69.9561        38.0887         12.8428 +/-  0.5632   19.2874 +/-  0.5632  0.030 / 0.060
G13     299.7005       33.6748         13.9500 +/-  0.9644   22.6987 +/-  0.9644  0.040 / 0.050
G17     211.9279       53.1689         15.5101 +/-  1.0816   18.8489 +/-  1.0816  0.040 / 0.100
G19     213.0852       26.1300         15.2289 +/-  3.1348   29.0022 +/-  3.1348  0.040 / 0.100
G28     343.1160       61.6511         12.6268 +/-  0.4521   14.1401 +/-  0.4521  0.040 / 0.090
G30     80.2026        79.5902         13.6960 +/-  0.8811   13.9014 +/-  0.8811  0.040 / 0.090