PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-22:42:50
G02     53.8           39.0               13.0 +/-    0.65      19.3 +/-    0.65  0.040 / 0.060
G05     69.9           67.3               13.7 +/-    0.44      14.7 +/-    0.44  0.050 / 0.070
G12     184.9          35.8               16.9 +/-    0.65      26.5 +/-    0.65  0.080 / 0.580
G13     132.9          12.2               20.1 +/-    3.94      53.4 +/-    3.94  0.100 / 0.450
G20     204.4          56.9               16.1 +/-    0.45      18.8 +/-    0.45  0.050 / 0.070
G21     267.4          14.5               17.2 +/-    2.92      43.3 +/-    2.92  0.050 / 0.080
G25     235.6          54.0               15.4 +/-    2.44      18.5 +/-    2.44  0.060 / 0.070
G29     326.4          51.9               14.2 +/-    0.35      17.5 +/-    0.35  0.070 / 0.060