PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:42:40
G02     334.0572       78.4428         13.4642 +/-  0.4471   13.7138 +/-  0.4471  0.030 / 0.020
G05     165.7598       34.5369         17.3263 +/-  0.9548   27.7353 +/-  0.9548  0.040 / 0.030
G06     42.9031        36.8598          3.0374 +/- 19.0268    4.6604 +/- 19.0268  0.030 / 0.020
G12     302.5521       75.8918         12.1422 +/-  0.8136   12.4799 +/-  0.8136  0.030 / 0.020
G19     79.3463        23.5893         -8.5595 +/- 59.6911  -17.2809 +/- 59.6911  0.060 / 0.090
G25     315.9955       36.1505         14.0602 +/-  1.2707   21.8485 +/-  1.2707  0.070 / 0.090
G29     289.0584       11.5930          5.4226 +/- 28.0096   14.6116 +/- 28.0096  0.040 / 0.100