PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/30-21:27:50
G02     41.2           49.2               11.3 +/-    0.81      14.4 +/-    0.81  0.060 / 0.060
G05     119.6          69.7               11.9 +/-    0.62      12.6 +/-    0.62  0.050 / 0.050
G12     189.1          52.9               13.4 +/-    1.46      16.4 +/-    1.46  0.050 / 0.090
G20     199.7          40.3               15.1 +/-    2.04      21.9 +/-    2.04  0.040 / 0.090
G25     264.8          60.6               13.8 +/-    0.96      15.6 +/-    0.96  0.030 / 0.050
G29     316.6          39.0               12.1 +/-    1.41      17.8 +/-    1.41  0.040 / 0.050