PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/31-21:43:10
G13     81.3           37.5               16.8 +/-    0.84      25.5 +/-    0.84  0.160 / 0.370
G15     129.6          50.1               19.5 +/-    0.81      24.6 +/-    0.81  0.240 / 0.570
G18     242.9          39.6               19.4 +/-    1.28      28.5 +/-    1.28  0.080 / 0.060
G20     26.4           68.4               15.9 +/-    0.41      16.9 +/-    0.41  0.060 / 0.080
G21     310.7          45.9               15.0 +/-    1.10      19.9 +/-    1.10  0.090 / 0.110
G25     197.8          10.8               20.9 +/-    4.58      57.3 +/-    4.58  0.090 / 0.130
G26     293.1          19.6               12.8 +/-    1.36      28.6 +/-    1.36  0.050 / 0.040
G29     151.5          71.8               17.5 +/-    0.84      18.3 +/-    0.84  0.040 / 0.040