PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/18-19:42:50
G10     261.1          33.7               12.8 +/-    1.39      20.9 +/-    1.39  0.140 / 0.400
G13     45.6           23.9               10.8 +/-    0.93      21.6 +/-    0.93  0.140 / 0.250
G15     65.7           52.1               13.1 +/-    0.42      16.1 +/-    0.42  0.040 / 0.060
G16     289.4          12.4               13.8 +/-    3.42      36.5 +/-    3.42  0.040 / 0.100
G18     290.4          62.7               12.4 +/-    0.84      13.8 +/-    0.84  0.040 / 0.050
G20     50.3           39.6               11.4 +/-    0.52      16.7 +/-    0.52  0.060 / 0.050
G21     357.0          69.7               13.6 +/-    0.80      14.5 +/-    0.80  0.100 / 0.400
G26     262.5          10.4               11.5 +/-    2.36      31.8 +/-    2.36  0.130 / 0.420
G27     320.1          15.8               11.2 +/-    1.35      27.3 +/-    1.35  0.060 / 0.210
G29     164.8          31.7               15.0 +/-    0.97      25.4 +/-    0.97  0.060 / 0.210