PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-14:43:10
G01     114.0153       21.1393         12.3869 +/-  0.9109   26.5113 +/-  0.9109  0.090 / 0.320
G07     96.4723        60.0347         12.6414 +/-  0.4847   14.3520 +/-  0.4847  0.080 / 0.280
G08     42.9325        25.1119          9.7976 +/-  1.0718   19.0949 +/-  1.0718  0.070 / 0.110
G09     175.1552       19.6597         11.7369 +/-  1.0989   26.0406 +/-  1.0989  0.070 / 0.120
G11     96.2830        39.7096         12.3626 +/-  0.5178   18.0670 +/-  0.5178  0.050 / 0.100
G13     315.9640       21.7446          8.6925 +/-  3.2893   18.3349 +/-  3.2893  0.050 / 0.090
G17     202.4256       32.3582         12.5758 +/-  1.8306   20.9937 +/-  1.8306  0.030 / 0.040
G28     302.8424       58.9608         10.3459 +/-  0.7061   11.8589 +/-  0.7061  0.040 / 0.040
G30     351.3103       70.9073         10.7890 +/-  0.8715   11.3483 +/-  0.8715  0.030 / 0.040