PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/19-18:57:40
G02     209.5508       44.0362         14.7271 +/-  0.8780   20.1230 +/-  0.8780  0.050 / 0.070
G06     108.6274       79.1790         11.9928 +/-  0.3969   12.1873 +/-  0.3969  0.050 / 0.090
G12     315.0984       27.8238          9.8331 +/-  1.8937   18.0371 +/-  1.8937  0.070 / 0.140
G17     50.2172        37.3610          9.4686 +/-  0.9849   14.4005 +/-  0.9849  0.050 / 0.130
G19     28.6950        54.9743         10.4054 +/-  0.7049   12.4014 +/-  0.7049  0.060 / 0.080
G24     283.2881       41.6907         10.6318 +/-  0.9392   15.0516 +/-  0.9392  0.060 / 0.100
G28     114.8947       21.5954         11.8661 +/-  1.4050   25.1190 +/-  1.4050  0.030 / 0.060