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               12.9 +/-    0.73      29.3 +/-    0.73  0.090 / 0.310
G10     55.7           59.8               17.7 +/-    0.29      20.2 +/-    0.29  0.080 / 0.250
G11     313.6          15.0                0.5 +/-    1.83       1.1 +/-    1.83  0.090 / 0.390
G14     262.0          64.7               -3.4 +/-    0.57      -3.7 +/-    0.57  0.090 / 0.370
G18     90.6           36.2               -4.6 +/-    0.62      -7.1 +/-    0.62  0.050 / 0.110
G21     152.6          12.9                0.1 +/-    2.62       0.2 +/-    2.62  0.050 / 0.120
G24     41.2           12.8               12.0 +/-    2.08      31.4 +/-    2.08  0.090 / 0.130
G27     232.5          17.1               11.7 +/-    1.61      27.6 +/-    1.61  0.110 / 0.160
G31     179.9          26.7                0.0 +/-    2.36       0.1 +/-    2.36  0.030 / 0.020
G32     326.8          75.1                5.7 +/-    0.60       5.9 +/-    0.60  0.020 / 0.020