PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-18:39:40
G08     270.0          18.9                7.0 +/-    0.73      15.9 +/-    0.73  0.090 / 0.310
G10     55.7           59.8                7.0 +/-    0.29       8.0 +/-    0.29  0.080 / 0.250
G11     313.6          15.0                7.6 +/-    1.83      18.8 +/-    1.83  0.090 / 0.390
G14     262.0          64.7                9.0 +/-    0.57       9.8 +/-    0.57  0.090 / 0.370
G18     90.6           36.2                7.5 +/-    0.62      11.7 +/-    0.62  0.050 / 0.110
G21     152.6          12.9                7.5 +/-    2.62      19.7 +/-    2.62  0.050 / 0.120
G24     41.2           12.8                7.3 +/-    2.08      19.2 +/-    2.08  0.090 / 0.130
G27     232.5          17.1                9.2 +/-    1.61      21.7 +/-    1.61  0.110 / 0.160
G31     179.9          26.7                9.5 +/-    2.36      17.9 +/-    2.36  0.030 / 0.020
G32     326.8          75.1                9.2 +/-    0.60       9.5 +/-    0.60  0.020 / 0.020