PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/19-16:57:10
G02     39.1           50.5                5.9 +/-    1.11       7.4 +/-    1.11  0.050 / 0.050
G05     122.3          69.0                6.4 +/-    0.41       6.8 +/-    0.41  0.050 / 0.040
G12     186.8          53.6                7.4 +/-    0.46       9.0 +/-    0.46  0.030 / 0.030
G25     273.7          59.3                3.7 +/-    1.08       4.2 +/-    1.08  0.030 / 0.030
G29     314.3          35.4                5.4 +/-    1.54       8.5 +/-    1.54  0.040 / 0.040