PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-07:27:50
G01     273.8217       41.3024          4.7634 +/-  1.2490    6.7849 +/-  1.2490  0.050 / 0.060
G03     314.9996       25.0798          2.4531 +/-  1.8953    4.7845 +/-  1.8953  0.060 / 0.070
G10     128.1490       20.1080          2.9466 +/-  2.5383    6.4664 +/-  2.5383  0.040 / 0.080
G11     249.7604       22.4019          4.6475 +/-  1.4157    9.6501 +/-  1.4157  0.050 / 0.060
G14     42.3406        50.1902          2.7569 +/-  0.7908    3.4687 +/-  0.7908  0.090 / 0.160
G22     314.6206       50.7594          3.2755 +/-  1.0540    4.0930 +/-  1.0540  0.130 / 0.170
G25     50.9824        15.3115          1.9044 +/-  1.8241    4.7012 +/-  1.8241  0.040 / 0.050
G26     150.2970       22.3352          4.5850 +/-  1.0896    9.5354 +/-  1.0896  0.050 / 0.060
G31     61.3296        76.0031          3.2738 +/-  0.5327    3.3634 +/-  0.5327  0.060 / 0.050
G32     61.5841        34.5618          3.7898 +/-  2.6227    6.0638 +/-  2.6227  0.070 / 0.050