PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-19:42:20
G02     39.6           50.3               13.5 +/-    0.76      16.9 +/-    0.76  0.040 / 0.040
G05     132.8          67.8               17.6 +/-    0.77      18.8 +/-    0.77  0.030 / 0.040
G06     59.2           9.4                10.8 +/-    1.54      30.4 +/-    1.54  0.030 / 0.040
G12     191.4          57.0               18.7 +/-    0.77      21.8 +/-    0.77  0.050 / 0.050
G20     199.3          36.6               20.6 +/-    1.33      31.8 +/-    1.33  0.030 / 0.020
G25     273.3          60.1               13.5 +/-    1.57      15.3 +/-    1.57  0.030 / 0.030
G29     315.1          37.4               14.1 +/-    1.30      21.4 +/-    1.30  0.040 / 0.070