PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:57:40
G01     107.9931       24.7391         12.0576 +/-  1.1809   23.7014 +/-  1.1809  0.080 / 0.240
G07     106.8597       55.5144         12.5704 +/-  0.7916   14.8981 +/-  0.7916  0.080 / 0.240
G08     41.8867        19.6784          9.6130 +/-  0.8479   21.3186 +/-  0.8479  0.040 / 0.070
G09     174.1282       13.7685         12.8439 +/-  0.8366   32.9074 +/-  0.8366  0.050 / 0.060
G11     87.6864        40.4369         12.3029 +/-  0.4224   17.7677 +/-  0.4224  0.040 / 0.090
G13     311.9330       26.1782         11.7107 +/-  1.8924   22.2779 +/-  1.8924  0.040 / 0.070
G17     204.6492       38.9229         12.3303 +/-  1.7273   18.2571 +/-  1.7273  0.030 / 0.080
G19     208.4327       13.3829         10.3081 +/-  1.7284   26.6530 +/-  1.7284  0.040 / 0.050
G28     315.2549       60.4991         12.0092 +/-  0.8342   13.5794 +/-  0.8342  0.030 / 0.030
G30     7.3236         75.8474         12.9756 +/-  0.4955   13.3388 +/-  0.4955  0.030 / 0.030