PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-19:43:00
G02     34.5           54.7               14.5 +/-    0.96      17.3 +/-    0.96  0.030 / 0.040
G05     143.7          63.5               17.8 +/-    0.39      19.6 +/-    0.39  0.030 / 0.030
G06     56.1           13.2               10.2 +/-    3.42      26.4 +/-    3.42  0.040 / 0.040
G12     194.8          63.2               17.2 +/-    0.61      19.1 +/-    0.61  0.030 / 0.040
G20     198.3          31.0               19.8 +/-    1.78      33.9 +/-    1.78  0.100 / 0.090
G25     284.8          58.9               11.4 +/-    0.83      13.1 +/-    0.83  0.050 / 0.110
G29     311.2          33.0               12.7 +/-    2.41      21.0 +/-    2.41  0.030 / 0.030