PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-18:43:00
G02     50.2           41.0               13.1 +/-    1.19      18.7 +/-    1.19  0.060 / 0.050
G05     94.2           71.5               15.7 +/-    0.49      16.5 +/-    0.49  0.040 / 0.050
G12     187.9          44.6               18.8 +/-    0.75      25.5 +/-    0.75  0.060 / 0.050
G20     202.6          48.5               18.0 +/-    1.48      23.2 +/-    1.48  0.040 / 0.060
G21     262.8          11.5                7.9 +/-   31.85      21.3 +/-   31.85  0.030 / 0.020
G25     249.9          57.9               15.7 +/-    0.74      18.2 +/-    0.74  0.020 / 0.020
G29     323.6          48.0               14.5 +/-    0.63      18.7 +/-    0.63  0.050 / 0.050