PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-17:12:00
G02     46.3           44.7                7.2 +/-    2.11       9.7 +/-    2.11  0.040 / 0.040
G05     95.5           70.8                6.5 +/-    1.20       6.8 +/-    1.20  0.020 / 0.040
G12     184.8          44.5                7.7 +/-    1.84      10.5 +/-    1.84  0.040 / 0.080
G25     255.9          58.6                7.6 +/-    0.63       8.8 +/-    0.63  0.040 / 0.070
G29     319.6          42.1                7.4 +/-    1.66      10.3 +/-    1.66  0.040 / 0.050