PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-19:57:30
G02     40.6           49.6               13.7 +/-    0.64      17.3 +/-    0.64  0.040 / 0.040
G05     129.0          68.6               15.7 +/-    0.82      16.8 +/-    0.82  0.060 / 0.070
G12     190.7          55.6               16.2 +/-    0.94      19.2 +/-    0.94  0.060 / 0.050
G20     199.5          38.0               20.0 +/-    1.53      30.0 +/-    1.53  0.030 / 0.050
G25     270.3          60.3               15.9 +/-    1.43      18.0 +/-    1.43  0.030 / 0.040
G29     315.8          38.3               14.1 +/-    1.65      21.1 +/-    1.65  0.030 / 0.040