PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-19:27:40
G01     313.3          27.4                8.8 +/-    1.83      16.2 +/-    1.83  0.160 / 0.160
G10     96.3           46.4               10.7 +/-    1.06      14.1 +/-    1.06  0.130 / 0.140
G11     292.0          26.9                8.4 +/-    1.27      15.7 +/-    1.27  0.140 / 0.230
G14     335.4          70.0                9.3 +/-    0.63       9.8 +/-    0.63  0.110 / 0.290
G18     112.0          18.8               11.3 +/-    1.21      25.6 +/-    1.21  0.030 / 0.040
G22     306.2          19.0                9.1 +/-    1.66      20.6 +/-    1.66  0.030 / 0.050
G25     90.2           13.8               12.4 +/-    1.45      31.7 +/-    1.45  0.030 / 0.020
G31     174.0          54.5               12.4 +/-    0.53      14.8 +/-    0.53  0.050 / 0.020
G32     25.4           59.0                9.5 +/-    0.55      10.9 +/-    0.55  0.040 / 0.040