PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/16-18:12:20
G02     43.8           46.6               15.1 +/-    0.54      19.9 +/-    0.54  0.040 / 0.040
G05     121.2          70.0               16.3 +/-    0.61      17.2 +/-    0.61  0.030 / 0.040
G12     190.6          53.5               17.0 +/-    0.66      20.6 +/-    0.66  0.030 / 0.050
G20     200.4          39.9               17.3 +/-    0.84      25.3 +/-    0.84  0.030 / 0.050
G25     267.2          59.8               16.5 +/-    0.69      18.7 +/-    0.69  0.020 / 0.020
G29     318.2          41.4               14.4 +/-    1.01      20.5 +/-    1.01  0.030 / 0.030