PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-01:43:00
G10     255.7893       29.8529         13.5020 +/-  1.9503   23.7175 +/-  1.9503  0.080 / 0.120
G13     49.3521        27.5753          8.4005 +/-  1.4840   15.4930 +/-  1.4840  0.090 / 0.130
G15     79.3964        57.5504          8.8748 +/-  2.5381   10.3076 +/-  2.5381  0.170 / 0.320
G16     291.0131       14.1889         -9.2429 +/- 66.0423  -23.4446 +/- 66.0423  0.160 / 0.250
G18     276.7554       58.0528         14.5973 +/-  3.9942   16.8734 +/-  3.9942  0.050 / 0.070
G20     47.7887        42.0174          9.5532 +/-  0.8495   13.4561 +/-  0.8495  0.040 / 0.070
G21     340.8457       64.2856         11.8479 +/-  2.8831   12.9982 +/-  2.8831  0.140 / 0.280
G26     263.5930       13.0663          5.2083 +/- 27.1135   13.5675 +/- 27.1135  0.170 / 0.260
G27     321.6626       11.3645         -0.6060 +/- 32.8434   -1.6412 +/- 32.8434  0.040 / 0.050
G29     165.8044       41.4748         22.8599 +/- 20.4003   32.4729 +/- 20.4003  0.040 / 0.050