PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-01:42:50
G10     255.7893       29.8529         12.3431 +/-  2.1862   21.6818 +/-  2.1862  0.100 / 0.240
G13     49.3521        27.5753          6.2180 +/-  1.5828   11.4678 +/-  1.5828  0.100 / 0.270
G15     79.3964        57.5504          5.9246 +/-  4.3223    6.8811 +/-  4.3223  0.140 / 0.260
G16     291.0131       14.1889          8.5248 +/-  1.3474   21.6231 +/-  1.3474  0.160 / 0.210
G18     276.7554       58.0528        -41.7813 +/- 61.6379  -48.2960 +/- 61.6379  0.110 / 0.080
G20     47.7887        42.0174          9.4350 +/-  3.4240   13.2897 +/-  3.4240  0.150 / 0.130
G21     340.8457       64.2856         11.2417 +/-  3.6279   12.3332 +/-  3.6279  0.050 / 0.070
G26     263.5930       13.0663         10.4803 +/-  2.8785   27.3009 +/-  2.8785  0.040 / 0.060
G27     321.6626       11.3645         -4.3428 +/- 29.6844  -11.7618 +/- 29.6844  0.250 / 0.190
G29     165.8044       41.4748         10.7695 +/-  0.5007   15.2982 +/-  0.5007  0.320 / 0.300