PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/19-16:57:40
G02     39.1           50.5                5.6 +/-    0.59       7.0 +/-    0.59  0.030 / 0.040
G05     122.3          69.0                6.5 +/-    0.40       6.9 +/-    0.40  0.030 / 0.030
G12     186.8          53.6                8.3 +/-    1.75      10.0 +/-    1.75  0.060 / 0.080
G25     273.7          59.3                6.9 +/-    1.65       7.9 +/-    1.65  0.050 / 0.060
G29     314.3          35.4                5.0 +/-    1.60       7.8 +/-    1.60  0.050 / 0.050