PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/17-19:43:10
G02     29.3           58.7               12.6 +/-    0.56      14.5 +/-    0.56  0.020 / 0.040
G05     150.6          58.9               16.4 +/-    0.79      18.8 +/-    0.79  0.020 / 0.040
G06     53.4           16.8                7.5 +/-    1.08      17.9 +/-    1.08  0.040 / 0.060
G12     199.9          68.6               12.4 +/-    0.90      13.2 +/-    0.90  0.050 / 0.060
G20     197.7          26.0               20.6 +/-    4.24      39.4 +/-    4.24  0.050 / 0.120
G25     293.9          56.6               13.6 +/-    1.04      15.9 +/-    1.04  0.040 / 0.130
G29     307.6          29.1               11.1 +/-    1.12      19.8 +/-    1.12  0.040 / 0.050