PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-22:12:20
G02     45.6           45.7               10.9 +/-    0.52      14.5 +/-    0.52  0.030 / 0.060
G05     99.8           70.8               12.5 +/-    0.74      13.2 +/-    0.74  0.060 / 0.060
G12     187.0          46.5               13.3 +/-    0.92      17.6 +/-    0.92  0.030 / 0.040
G20     201.0          46.2               15.3 +/-    1.70      20.3 +/-    1.70  0.030 / 0.030
G25     253.4          59.3               12.7 +/-    0.78      14.5 +/-    0.78  0.040 / 0.070
G29     320.0          43.3               10.9 +/-    1.45      15.1 +/-    1.45  0.040 / 0.070