PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/23-17:57:50
G08     285.8          22.5                8.0 +/-    1.30      16.5 +/-    1.30  0.080 / 0.130
G10     22.9           63.1                9.2 +/-    2.15      10.2 +/-    2.15  0.100 / 0.090
G14     237.9          53.0               10.9 +/-    1.89      13.3 +/-    1.89  0.150 / 0.210
G18     74.5           45.5                9.3 +/-    0.52      12.5 +/-    0.52  0.230 / 0.220
G21     148.5          27.8               13.1 +/-    0.97      24.1 +/-    0.97  0.170 / 0.270
G24     50.5           22.7                8.4 +/-    3.69      17.3 +/-    3.69  0.260 / 0.360
G27     245.3          27.1                9.5 +/-    1.91      17.8 +/-    1.91  0.030 / 0.020
G31     183.0          12.0                6.4 +/-   11.99      17.1 +/-   11.99  0.020 / 0.020
G32     264.8          72.5                8.7 +/-    0.84       9.1 +/-    0.84  0.100 / 0.110