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               71.0 +/-    0.73     160.4 +/-    0.73  0.090 / 0.310
G10     55.7           59.8              133.0 +/-    0.29     151.3 +/-    0.29  0.080 / 0.250
G11     313.6          15.0               53.2 +/-    1.83     132.3 +/-    1.83  0.090 / 0.390
G14     262.0          64.8              116.6 +/-    0.57     127.5 +/-    0.57  0.090 / 0.370
G18     90.6           36.2               79.9 +/-    0.62     124.1 +/-    0.62  0.050 / 0.110
G21     152.6          12.9               50.2 +/-    2.62     131.4 +/-    2.62  0.050 / 0.120
G24     41.2           12.8               62.0 +/-    2.08     162.6 +/-    2.08  0.090 / 0.130
G27     232.5          17.1               67.2 +/-    1.61     158.8 +/-    1.61  0.110 / 0.160
G31     179.9          26.7               69.8 +/-    2.36     131.2 +/-    2.36  0.030 / 0.020
G32     326.9          75.1              147.1 +/-    0.60     151.7 +/-    0.60  0.020 / 0.020