PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-20:42:40
G05     51.4           13.9               10.5 +/-    1.46      26.8 +/-    1.46  0.100 / 0.250
G10     241.9          17.8               14.6 +/-    1.08      33.9 +/-    1.08  0.090 / 0.210
G13     66.8           36.1               12.1 +/-    0.74      18.9 +/-    0.74  0.050 / 0.060
G15     109.7          56.4               15.0 +/-    0.45      17.6 +/-    0.45  0.050 / 0.070
G16     309.8          12.8               11.5 +/-    1.95      30.2 +/-    1.95  0.120 / 0.440
G18     254.5          48.7               16.4 +/-    1.15      21.0 +/-    1.15  0.110 / 0.390
G20     34.9           58.2               13.6 +/-    0.56      15.7 +/-    0.56  0.050 / 0.110
G21     322.5          53.8               15.3 +/-    1.09      18.5 +/-    1.09  0.060 / 0.120
G26     282.6          18.3               12.4 +/-    1.73      28.6 +/-    1.73  0.040 / 0.040
G29     158.6          58.0               15.2 +/-    0.60      17.6 +/-    0.60  0.040 / 0.050