PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/23-20:13:10
G02     51.4           40.3               14.0 +/-    0.69      20.3 +/-    0.69  0.050 / 0.070
G05     87.1           71.1               16.1 +/-    0.33      17.0 +/-    0.33  0.040 / 0.080
G12     186.8          41.6               18.8 +/-    0.95      26.7 +/-    0.95  0.050 / 0.050
G20     203.1          51.4               20.2 +/-    1.19      25.0 +/-    1.19  0.040 / 0.060
G21     264.3          12.4               19.4 +/-    4.01      51.5 +/-    4.01  0.030 / 0.040
G25     243.6          56.9               18.1 +/-    0.40      21.2 +/-    0.40  0.030 / 0.030
G29     324.5          49.1               13.9 +/-    0.92      17.8 +/-    0.92  0.040 / 0.070