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                6.2 +/-    1.50       9.3 +/-    1.50  0.310 / 0.620
G05     73.6           68.0                7.4 +/-    0.64       8.0 +/-    0.64  0.310 / 0.450
G12     184.6          39.4                8.2 +/-    1.41      12.0 +/-    1.41  0.220 / 0.470
G13     131.7          10.5                3.0 +/-   21.10       8.3 +/-   21.10  0.260 / 0.490
G21     266.1          12.4                4.3 +/-   15.54      11.4 +/-   15.54  0.050 / 0.070
G25     249.4          55.9               11.1 +/-    2.53      13.1 +/-    2.53  0.070 / 0.060
G29     323.9          47.7                6.7 +/-    0.79       8.7 +/-    0.79  0.030 / 0.030