PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-18:42:40
G02     60.7           32.0               11.8 +/-    1.35      19.8 +/-    1.35  0.080 / 0.260
G05     59.7           64.1               12.9 +/-    0.86      14.2 +/-    0.86  0.090 / 0.400
G12     185.1          31.0               14.3 +/-    1.76      24.6 +/-    1.76  0.040 / 0.100
G13     128.6          16.2               17.9 +/-    1.47      43.3 +/-    1.47  0.040 / 0.110
G15     163.0          13.1               17.2 +/-    1.58      44.8 +/-    1.58  0.050 / 0.060
G20     208.5          62.3               15.9 +/-    0.32      17.7 +/-    0.32  0.060 / 0.060
G21     272.9          19.5               10.6 +/-    1.15      23.6 +/-    1.15  0.040 / 0.050
G25     229.6          49.9               14.5 +/-    1.78      18.3 +/-    1.78  0.030 / 0.050
G29     333.1          60.1               11.8 +/-    1.03      13.4 +/-    1.03  0.030 / 0.040