PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-18:27:30
G02     55.4           36.5               10.8 +/-    0.77      16.7 +/-    0.77  0.260 / 0.430
G05     73.8           68.9               12.0 +/-    0.79      12.7 +/-    0.79  0.250 / 0.450
G12     186.5          38.1               14.1 +/-    2.38      21.2 +/-    2.38  0.040 / 0.090
G13     133.6          11.7               17.1 +/-    2.10      45.9 +/-    2.10  0.040 / 0.090
G20     205.0          54.9               14.5 +/-    2.41      17.3 +/-    2.41  0.040 / 0.070
G21     267.6          15.5               10.6 +/-    1.54      26.0 +/-    1.54  0.040 / 0.060
G25     239.3          54.7               13.6 +/-    0.91      16.3 +/-    0.91  0.060 / 0.080
G29     328.2          53.8                9.0 +/-    0.92      10.9 +/-    0.92  0.060 / 0.060