PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-19:57:30
G02     37.2           52.4               16.7 +/-    0.59      20.5 +/-    0.59  0.050 / 0.050
G05     137.5          66.1               17.7 +/-    0.37      19.2 +/-    0.37  0.040 / 0.060
G06     57.9           11.0               12.5 +/-    1.06      34.2 +/-    1.06  0.040 / 0.040
G12     192.6          59.7               20.3 +/-    1.50      23.1 +/-    1.50  0.050 / 0.050
G20     198.8          34.2               24.2 +/-    1.66      39.0 +/-    1.66  0.030 / 0.040
G25     278.3          59.9               20.5 +/-    0.70      23.3 +/-    0.70  0.030 / 0.050
G29     313.3          35.3               17.6 +/-    1.33      27.8 +/-    1.33  0.050 / 0.080