PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/27-17:27:10
G02     44.1           46.2               15.1 +/-    0.61      20.0 +/-    0.61  0.050 / 0.060
G05     119.1          70.0               20.1 +/-    0.52      21.3 +/-    0.52  0.080 / 0.060
G12     190.9          53.7               22.3 +/-    1.03      26.9 +/-    1.03  0.040 / 0.060
G20     200.6          39.6               25.8 +/-    0.95      37.8 +/-    0.95  0.030 / 0.050
G25     268.1          59.6               18.5 +/-    1.15      21.1 +/-    1.15  0.030 / 0.040
G29     318.6          41.9               14.9 +/-    1.57      21.1 +/-    1.57  0.020 / 0.040