PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:28:00
G01     120.3111       16.7135         11.0595 +/-  1.2945   26.3803 +/-  1.2945  0.120 / 0.410
G07     81.6844        64.2775         11.5780 +/-  0.7545   12.7028 +/-  0.7545  0.100 / 0.400
G08     45.2961        31.2657          9.5476 +/-  0.4520   16.2907 +/-  0.4520  0.110 / 0.180
G09     176.0774       26.7316         11.4601 +/-  2.6580   21.5330 +/-  2.6580  0.060 / 0.180
G11     105.6057       37.5980         12.4321 +/-  1.2196   18.8295 +/-  1.2196  0.070 / 0.110
G13     319.3696       16.2477          7.6248 +/-  2.1612   18.3968 +/-  2.1612  0.060 / 0.130
G17     200.5541       24.9987         10.1779 +/-  1.0622   19.8875 +/-  1.0622  0.030 / 0.040
G28     289.6234       56.4295         10.4349 +/-  0.8642   12.2530 +/-  0.8642  0.030 / 0.040
G30     339.5822       64.8590         10.7277 +/-  0.7121   11.7202 +/-  0.7121  0.040 / 0.040