PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-21:57:30
G02     39.7           50.6               12.2 +/-    0.49      15.3 +/-    0.49  0.030 / 0.040
G05     121.9          69.1               13.2 +/-    0.65      14.1 +/-    0.65  0.030 / 0.050
G12     189.2          54.0               12.9 +/-    1.68      15.6 +/-    1.68  0.040 / 0.030
G20     199.4          39.1               14.4 +/-    1.22      21.2 +/-    1.22  0.030 / 0.030
G25     268.5          60.4               12.8 +/-    0.77      14.5 +/-    0.77  0.040 / 0.060
G29     315.6          37.8               12.2 +/-    0.81      18.5 +/-    0.81  0.040 / 0.060