PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-18:57:50
G02     43.8           46.7                6.9 +/-    0.96       9.1 +/-    0.96  0.040 / 0.060
G05     102.1          69.8                8.3 +/-    0.44       8.8 +/-    0.44  0.040 / 0.060
G12     183.9          47.4               11.5 +/-    1.73      15.0 +/-    1.73  0.030 / 0.030
G25     267.2          58.9                9.3 +/-    1.06      10.7 +/-    1.06  0.030 / 0.040
G29     316.5          38.1                8.1 +/-    1.01      12.2 +/-    1.01  0.040 / 0.060