PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/31-21:43:00
G13     81.9           37.5               16.6 +/-    0.73      25.1 +/-    0.73  0.200 / 0.360
G15     130.2          49.8               19.8 +/-    1.08      25.1 +/-    1.08  0.200 / 0.320
G18     242.5          39.3               23.3 +/-    6.20      34.2 +/-    6.20  0.040 / 0.090
G20     26.0           68.8               20.5 +/-    5.82      21.8 +/-    5.82  0.040 / 0.070
G21     310.3          45.6               18.3 +/-    5.95      24.5 +/-    5.95  0.070 / 0.130
G25     198.0          11.2               21.7 +/-    4.35      58.9 +/-    4.35  0.060 / 0.130
G26     293.6          19.5               16.6 +/-    6.42      36.8 +/-    6.42  0.020 / 0.040
G29     151.1          72.3               21.9 +/-    6.11      22.9 +/-    6.11  0.050 / 0.040