PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-19:42:30
G02     227.7660       66.3277         19.0988 +/-  6.2666   20.6531 +/-  6.2666  0.160 / 0.320
G06     43.2016        63.2177          9.0502 +/- 14.3053   10.0092 +/- 14.3053  0.170 / 0.400
G12     321.8152       48.3935         17.8674 +/- 10.4599   22.9937 +/- 10.4599  0.080 / 0.130
G17     68.3799        23.1630         14.7759 +/-  7.4380   30.1319 +/-  7.4380  0.090 / 0.120
G19     53.9057        40.1677          2.5423 +/- 43.4146    3.6876 +/- 43.4146  0.060 / 0.100
G24     253.3791       37.9024         11.2818 +/- 18.5005   16.9974 +/- 18.5005  0.050 / 0.100
G25     315.9339       11.8748          8.7660 +/- 30.4663   23.4711 +/- 30.4663  0.030 / 0.050