PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-16:28:10
G01     60.1967        30.2757         12.5374 +/-  0.7464   21.8303 +/-  0.7464  0.110 / 0.320
G06     179.9426       15.1690         13.0560 +/-  1.5045   32.3418 +/-  1.5045  0.100 / 0.280
G07     141.7397       19.0335         13.5049 +/-  1.7714   30.4264 +/-  1.7714  0.100 / 0.190
G11     47.4748        20.9406         12.4985 +/-  2.4997   26.8790 +/-  2.4997  0.120 / 0.200
G13     265.1044       34.9964         14.6597 +/-  1.6877   23.2664 +/-  1.6877  0.080 / 0.130
G15     297.9164       15.1287          9.2301 +/-  2.0644   22.8869 +/-  2.0644  0.110 / 0.130
G17     265.6533       78.5017         13.3918 +/-  0.4711   13.6374 +/-  0.4711  0.040 / 0.070
G19     232.9564       52.6880         15.0127 +/-  1.9513   18.3431 +/-  1.9513  0.050 / 0.060
G28     35.2835        56.6752         14.9503 +/-  1.4847   17.5125 +/-  1.4847  0.040 / 0.030
G30     143.1221       55.2215         13.8340 +/-  0.5955   16.4452 +/-  0.5955  0.040 / 0.040