PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-19:42:50
G02     30.8           57.6               17.1 +/-    0.50      19.9 +/-    0.50  0.040 / 0.060
G05     148.9          60.2               18.5 +/-    0.84      21.0 +/-    0.84  0.030 / 0.050
G06     54.1           15.8               11.4 +/-    1.40      27.8 +/-    1.40  0.040 / 0.050
G12     198.3          67.2               18.2 +/-    1.20      19.6 +/-    1.20  0.030 / 0.050
G20     197.9          27.4               24.0 +/-    2.20      44.4 +/-    2.20  0.040 / 0.040
G25     291.6          57.3               18.9 +/-    0.91      22.0 +/-    0.91  0.030 / 0.040
G29     308.6          30.2               16.2 +/-    1.42      28.3 +/-    1.42  0.110 / 0.100