PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-21:58:00
G02     36.1           53.4               13.0 +/-    1.58      15.7 +/-    1.58  0.030 / 0.050
G05     131.3          66.9               15.4 +/-    0.31      16.5 +/-    0.31  0.040 / 0.040
G06     58.4           10.0               11.1 +/-    2.87      31.0 +/-    2.87  0.040 / 0.050
G12     190.7          58.1               15.7 +/-    0.63      18.1 +/-    0.63  0.030 / 0.040
G20     198.6          35.3               19.0 +/-    1.17      30.0 +/-    1.17  0.030 / 0.040
G25     276.9          60.0               20.2 +/-    2.45      22.9 +/-    2.45  0.040 / 0.040
G29     313.1          34.8               13.8 +/-    1.12      21.9 +/-    1.12  0.030 / 0.030