PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-15:57:50
G02     203.0          29.2               14.1 +/-    2.37      25.2 +/-    2.37  0.120 / 0.230
G06     164.0          65.7               12.9 +/-    0.94      14.0 +/-    0.94  0.130 / 0.260
G12     306.3          13.4                7.8 +/-    1.29      20.2 +/-    1.29  0.030 / 0.050
G17     36.0           49.3               10.3 +/-    0.37      13.1 +/-    0.37  0.030 / 0.050
G19     0.3            66.1               10.7 +/-    0.51      11.6 +/-    0.51  0.050 / 0.100
G24     302.8          35.3                9.0 +/-    0.96      14.2 +/-    0.96  0.050 / 0.090
G28     100.0          32.8                9.5 +/-    1.39      15.8 +/-    1.39  0.030 / 0.030