PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/23-04:13:00
G10     244.8          21.4                9.2 +/-    3.06      19.6 +/-    3.06  0.050 / 0.040
G13     60.9           33.5                6.4 +/-    2.01      10.5 +/-    2.01  0.050 / 0.050
G15     101.6          57.5                8.1 +/-    0.46       9.4 +/-    0.46  0.080 / 0.140
G20     275.3          61.9                7.0 +/-    0.69       7.8 +/-    0.69  0.060 / 0.110
G21     325.0          54.9                6.7 +/-    0.79       8.1 +/-    0.79  0.030 / 0.040
G26     273.3          18.2                9.1 +/-    1.35      20.8 +/-    1.35  0.030 / 0.030
G29     162.9          58.8                7.8 +/-    0.66       8.9 +/-    0.66  0.040 / 0.040