PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-22:42:40
G02     53.8           39.0               13.4 +/-    0.88      19.9 +/-    0.88  0.040 / 0.060
G05     69.9           67.3               14.2 +/-    0.61      15.2 +/-    0.61  0.050 / 0.060
G12     184.9          35.8               19.0 +/-    1.52      29.7 +/-    1.52  0.040 / 0.060
G13     132.9          12.2               18.6 +/-    2.83      49.4 +/-    2.83  0.050 / 0.060
G20     204.4          56.9               17.4 +/-    0.78      20.4 +/-    0.78  0.140 / 0.280
G21     267.4          14.5               18.6 +/-    1.61      47.0 +/-    1.61  0.090 / 0.350
G25     235.6          54.0               15.6 +/-    0.64      18.8 +/-    0.64  0.050 / 0.100
G29     326.4          51.9               14.0 +/-    0.94      17.3 +/-    0.94  0.040 / 0.060