PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-18:42:40
G02     37.8           51.6                7.4 +/-    0.41       9.2 +/-    0.41  0.040 / 0.060
G05     122.9          67.7                9.6 +/-    0.51      10.3 +/-    0.51  0.040 / 0.050
G12     185.5          55.0               10.3 +/-    1.10      12.3 +/-    1.10  0.030 / 0.040
G25     281.5          58.1                9.2 +/-    1.24      10.7 +/-    1.24  0.020 / 0.030
G29     312.1          32.7                7.6 +/-    0.99      12.5 +/-    0.99  0.040 / 0.060