PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-16:12:00
G02     44.0           45.7                7.6 +/-    0.61      10.1 +/-    0.61  0.030 / 0.030
G05     107.8          70.3                9.6 +/-    0.67      10.2 +/-    0.67  0.030 / 0.030
G12     187.3          51.5               10.1 +/-    2.12      12.5 +/-    2.12  0.040 / 0.050
G25     271.5          58.1               10.7 +/-    0.51      12.4 +/-    0.51  0.050 / 0.070
G29     316.7          38.5                7.8 +/-    0.88      11.6 +/-    0.88  0.040 / 0.040