PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-21:27:50
G02     24.0           62.3               10.8 +/-    1.17      12.0 +/-    1.17  0.050 / 0.060
G05     151.0          56.9               11.8 +/-    0.66      13.8 +/-    0.66  0.040 / 0.050
G06     52.0           18.5                7.9 +/-    0.93      18.1 +/-    0.93  0.080 / 0.140
G12     201.7          71.0               10.3 +/-    1.17      10.9 +/-    1.17  0.060 / 0.120
G19     97.8           10.5                9.6 +/-    2.11      26.6 +/-    2.11  0.030 / 0.030
G20     197.2          23.6               13.8 +/-    1.17      27.9 +/-    1.17  0.030 / 0.030
G25     298.4          54.8               11.4 +/-    1.58      13.6 +/-    1.58  0.040 / 0.050
G29     305.1          26.2                8.8 +/-    1.18      16.8 +/-    1.18  0.030 / 0.050