PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-22:57:50
G01     220.6          11.3                9.6 +/-    1.35      26.1 +/-    1.35  0.050 / 0.030
G03     261.5          70.0                7.5 +/-    0.80       7.9 +/-    0.80  0.030 / 0.040
G09     298.9          12.4                4.9 +/-    8.06      13.0 +/-    8.06  0.070 / 0.190
G14     93.9           18.9                6.6 +/-    1.12      15.0 +/-    1.12  0.180 / 0.120
G16     143.7          51.7                9.6 +/-    0.54      11.8 +/-    0.54  0.040 / 0.050
G22     203.0          63.6                8.2 +/-    0.75       9.1 +/-    0.75  0.030 / 0.040
G23     313.2          42.8                6.2 +/-    0.96       8.7 +/-    0.96  0.120 / 0.270
G26     84.4           55.1                7.6 +/-    1.08       9.0 +/-    1.08  0.110 / 0.260
G31     48.1           26.9                5.3 +/-    2.48      10.0 +/-    2.48  0.400 / 0.260