PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-21:43:00
G02     51.4           40.0                8.8 +/-    1.79      12.8 +/-    1.79  0.030 / 0.030
G05     75.8           67.4               11.2 +/-    0.52      12.0 +/-    0.52  0.030 / 0.030
G12     183.9          39.9               13.5 +/-    0.69      19.6 +/-    0.69  0.120 / 0.270
G21     263.9          10.9               -0.2 +/-   22.60      -0.7 +/-   22.60  0.140 / 0.450
G25     251.8          56.9               10.8 +/-    1.68      12.7 +/-    1.68  0.040 / 0.060
G29     321.7          45.0               10.7 +/-    0.69      14.5 +/-    0.69  0.050 / 0.050