PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-17:58:10
G02     49.4           41.6               11.9 +/-    0.44      16.8 +/-    0.44  0.050 / 0.060
G05     97.3           71.3               12.9 +/-    0.35      13.6 +/-    0.35  0.040 / 0.060
G12     188.5          46.3               13.1 +/-    1.75      17.3 +/-    1.75  0.100 / 0.650
G20     202.3          46.7               16.0 +/-    1.09      21.0 +/-    1.09  0.120 / 0.630
G21     261.9          11.0                0.8 +/-   23.66       2.3 +/-   23.66  0.040 / 0.060
G25     253.5          58.4               13.3 +/-    0.66      15.3 +/-    0.66  0.040 / 0.040
G29     323.0          47.2                9.7 +/-    0.73      12.6 +/-    0.73  0.040 / 0.070