PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/18-20:28:10
G10     253.4          29.2               11.5 +/-    2.55      20.4 +/-    2.55  0.040 / 0.040
G13     50.6           27.7                8.2 +/-    1.92      15.1 +/-    1.92  0.050 / 0.050
G15     88.7           59.9               10.6 +/-    0.50      12.1 +/-    0.50  0.130 / 0.390
G16     291.8          15.4                7.9 +/-    1.55      19.5 +/-    1.55  0.110 / 0.370
G20     274.3          52.9               10.2 +/-    3.01      12.4 +/-    3.01  0.140 / 0.170
G21     338.2          62.5               10.3 +/-    0.91      11.5 +/-    0.91  0.140 / 0.260
G26     264.6          14.2                8.8 +/-    1.48      22.4 +/-    1.48  0.030 / 0.040
G29     165.6          46.8               11.0 +/-    0.76      14.4 +/-    0.76  0.030 / 0.030