PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/20-18:12:00
G02     43.8           46.1                7.0 +/-    0.63       9.3 +/-    0.63  0.040 / 0.070
G05     102.2          69.9                8.9 +/-    0.65       9.4 +/-    0.65  0.040 / 0.100
G12     188.4          51.7               10.1 +/-    1.32      12.5 +/-    1.32  0.050 / 0.060
G25     270.4          58.1                9.7 +/-    0.46      11.2 +/-    0.46  0.040 / 0.050
G29     317.4          39.5                8.9 +/-    1.78      13.0 +/-    1.78  0.030 / 0.030