PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/19-16:27:40
G02     51.5           39.4                5.8 +/-    0.70       8.5 +/-    0.70  0.030 / 0.030
G05     78.5           68.9                7.5 +/-    0.58       8.0 +/-    0.58  0.020 / 0.040
G12     185.0          41.4                8.8 +/-    1.66      12.5 +/-    1.66  0.140 / 0.620
G21     264.7          11.2                5.5 +/-   15.43      15.1 +/-   15.43  0.120 / 0.570
G25     252.9          56.7                8.9 +/-    1.09      10.4 +/-    1.09  0.040 / 0.070
G29     322.7          46.1                5.8 +/-    0.85       7.7 +/-    0.85  0.030 / 0.070