PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-15:27:50
G10     264.2          35.9                6.5 +/-    1.20      10.2 +/-    1.20  0.100 / 0.160
G13     43.6           21.2                4.3 +/-    1.93       9.1 +/-    1.93  0.090 / 0.110
G15     60.8           49.2                5.6 +/-    0.69       7.1 +/-    0.69  0.180 / 0.290
G16     285.3          12.0                5.9 +/-    2.14      15.7 +/-    2.14  0.160 / 0.300
G18     299.5          64.8                6.2 +/-    0.98       6.8 +/-    0.98  0.080 / 0.080
G20     51.1           39.4                4.4 +/-    1.10       6.5 +/-    1.10  0.050 / 0.060
G21     12.7           72.4                5.8 +/-    0.99       6.1 +/-    0.99  0.240 / 0.430
G24     123.4          12.5                8.3 +/-    1.98      21.8 +/-    1.98  0.220 / 0.450
G27     319.1          18.1                6.0 +/-    1.79      13.8 +/-    1.79  0.170 / 0.200
G29     166.0          30.0                7.3 +/-    1.63      12.8 +/-    1.63  0.100 / 0.210