PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/20-16:28:00
G02     53.1           38.1                6.0 +/-    1.33       9.0 +/-    1.33  0.030 / 0.040
G05     73.6           68.0                7.0 +/-    0.68       7.5 +/-    0.68  0.030 / 0.040
G12     184.6          39.4                9.2 +/-    1.10      13.5 +/-    1.10  0.230 / 0.750
G21     266.1          12.4                5.9 +/-    9.08      15.6 +/-    9.08  0.240 / 0.560
G25     249.4          55.9                7.8 +/-    0.84       9.2 +/-    0.84  0.050 / 0.080
G29     323.9          47.7                6.6 +/-    1.06       8.6 +/-    1.06  0.100 / 0.080