PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-21:58:10
G02     41.8           48.8               10.1 +/-    1.25      13.0 +/-    1.25  0.060 / 0.050
G05     115.0          70.0               10.6 +/-    0.92      11.2 +/-    0.92  0.040 / 0.070
G12     188.4          51.5               13.5 +/-    0.41      16.8 +/-    0.41  0.040 / 0.050
G20     199.9          41.5               13.5 +/-    0.90      19.2 +/-    0.90  0.050 / 0.050
G25     263.1          60.3               11.7 +/-    0.92      13.2 +/-    0.92  0.030 / 0.040
G29     317.1          39.7               10.2 +/-    0.44      14.9 +/-    0.44  0.030 / 0.040