PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:58:10
G01     107.5424       24.9818         12.1115 +/-  1.2689   23.6749 +/-  1.2689  0.170 / 0.200
G07     107.5225       55.1693         12.8714 +/-  0.4534   15.3093 +/-  0.4534  0.190 / 0.180
G08     41.8436        19.2911         10.0278 +/-  1.8853   22.4502 +/-  1.8853  0.040 / 0.030
G09     174.0457       13.3588         10.1346 +/-  1.9426   26.2191 +/-  1.9426  0.040 / 0.030
G11     87.0678        40.4450         11.3634 +/-  1.0574   16.4087 +/-  1.0574  0.100 / 0.210
G13     311.6051       26.4770         10.5639 +/-  1.5280   19.9621 +/-  1.5280  0.110 / 0.190
G17     204.8318       39.3952         12.9346 +/-  0.9761   19.0014 +/-  0.9761  0.100 / 0.130
G19     208.5494       13.7981          9.2065 +/-  1.7037   23.5715 +/-  1.7037  0.090 / 0.140
G28     316.1646       60.5843         10.1368 +/-  0.5629   11.4539 +/-  0.5629  0.040 / 0.020
G30     8.8228         76.1686         11.7319 +/-  0.4704   12.0453 +/-  0.4704  0.040 / 0.020