PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-19:58:00
G02     42.2           48.2               11.0 +/-    0.95      14.2 +/-    0.95  0.030 / 0.040
G05     124.1          69.7               11.9 +/-    0.97      12.6 +/-    0.97  0.040 / 0.040
G12     190.0          53.6               12.3 +/-    0.91      14.9 +/-    0.91  0.040 / 0.040
G20     199.9          39.9               12.5 +/-    1.19      18.2 +/-    1.19  0.030 / 0.040
G25     266.2          60.3               12.7 +/-    0.84      14.4 +/-    0.84  0.020 / 0.020
G29     317.1          39.8               12.7 +/-    1.50      18.5 +/-    1.50  0.020 / 0.020