PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-22:42:40
G10     296.2          51.0               15.1 +/-    1.82      18.9 +/-    1.82  0.080 / 0.060
G14     210.0          13.1               21.6 +/-    2.87      56.2 +/-    2.87  0.090 / 0.070
G15     46.2           28.8               12.6 +/-    1.54      22.6 +/-    1.54  0.040 / 0.030
G18     357.7          66.1               14.8 +/-    0.63      16.0 +/-    0.63  0.030 / 0.030
G20     71.4           17.9               12.2 +/-    1.08      28.3 +/-    1.08  0.060 / 0.100
G21     98.4           72.9               16.6 +/-    0.73      17.3 +/-    0.73  0.100 / 0.120
G24     99.3           26.5               16.7 +/-    1.07      31.6 +/-    1.07  0.120 / 0.390
G27     299.0          35.1               14.6 +/-    1.40      23.1 +/-    1.40  0.100 / 0.550
G32     211.3          29.1               20.2 +/-    2.46      36.1 +/-    2.46  0.080 / 0.080