PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-21:43:00
G10     263.5          35.3               16.1 +/-    1.08      25.4 +/-    1.08  0.040 / 0.040
G13     44.3           22.3               13.1 +/-    1.98      27.4 +/-    1.98  0.040 / 0.050
G15     63.2           51.2               18.0 +/-    1.08      22.4 +/-    1.08  0.140 / 0.400
G16     285.7          12.1               13.3 +/-    1.53      35.3 +/-    1.53  0.120 / 0.330
G18     294.1          63.3               16.7 +/-    0.29      18.4 +/-    0.29  0.160 / 0.570
G20     52.5           36.9               14.7 +/-    0.88      22.5 +/-    0.88  0.210 / 0.500
G21     359.2          70.6               17.4 +/-    0.68      18.4 +/-    0.68  0.060 / 0.120
G24     124.1          12.0                7.7 +/-   52.01      20.4 +/-   52.01  0.040 / 0.110
G27     319.2          17.8               11.9 +/-    0.62      27.8 +/-    0.62  0.110 / 0.170
G29     165.9          30.5               19.4 +/-    1.09      33.6 +/-    1.09  0.110 / 0.170