PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:27:50
G01     120.3111       16.7135         12.0104 +/-  0.9820   28.6486 +/-  0.9820  0.110 / 0.150
G07     81.6844        64.2775         10.4515 +/-  0.5919   11.4669 +/-  0.5919  0.120 / 0.140
G08     45.2961        31.2657          8.2662 +/-  0.8641   14.1044 +/-  0.8641  0.030 / 0.030
G09     176.0774       26.7316          9.0373 +/-  1.4231   16.9807 +/-  1.4231  0.040 / 0.030
G11     105.6057       37.5980         11.5117 +/-  1.0293   17.4355 +/-  1.0293  0.160 / 0.320
G13     319.3696       16.2477          9.4329 +/-  2.6126   22.7593 +/-  2.6126  0.160 / 0.320
G17     200.5541       24.9987          9.2551 +/-  3.1143   18.0844 +/-  3.1143  0.170 / 0.210
G28     289.6234       56.4295          9.6878 +/-  1.2998   11.3758 +/-  1.2998  0.160 / 0.230
G30     339.5822       64.8590         10.2280 +/-  0.5425   11.1742 +/-  0.5425  0.030 / 0.030