PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-16:42:50
G10     299.2          52.1                8.2 +/-    0.82      10.0 +/-    0.82  0.080 / 0.080
G14     210.8          13.5               11.1 +/-    1.84      28.6 +/-    1.84  0.070 / 0.080
G15     45.7           25.4                7.2 +/-    0.98      14.0 +/-    0.98  0.030 / 0.050
G18     6.9            65.3                7.5 +/-    0.60       8.2 +/-    0.60  0.030 / 0.050
G20     71.7           19.4                7.5 +/-    1.40      16.9 +/-    1.40  0.080 / 0.120
G21     108.5          67.8                7.8 +/-    0.69       8.4 +/-    0.69  0.060 / 0.110
G24     97.0           27.2               12.4 +/-    1.26      23.0 +/-    1.26  0.100 / 0.260
G27     297.2          35.7                5.9 +/-    1.13       9.3 +/-    1.13  0.090 / 0.190
G32     211.7          32.9                9.5 +/-    1.47      15.7 +/-    1.47  0.080 / 0.110