PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/17-08:27:50
G08     277.2          20.1                5.8 +/-    1.13      12.7 +/-    1.13  0.050 / 0.060
G10     46.9           60.9                4.9 +/-    0.91       5.5 +/-    0.91  0.040 / 0.050
G14     249.3          56.7                8.3 +/-    0.76       9.7 +/-    0.76  0.210 / 0.540
G18     315.6          24.8                5.9 +/-    1.60      11.6 +/-    1.60  0.220 / 0.480
G20     97.2           22.9                5.0 +/-    1.36      10.3 +/-    1.36  0.090 / 0.160
G21     153.3          22.6                5.7 +/-    0.76      11.8 +/-    0.76  0.090 / 0.170
G24     42.8           14.9                3.2 +/-    2.66       8.1 +/-    2.66  0.160 / 0.210
G27     237.0          20.5                8.4 +/-    1.77      18.2 +/-    1.77  0.350 / 0.410
G31     178.3          24.9                5.2 +/-    1.73      10.1 +/-    1.73  0.220 / 0.230
G32     317.8          76.5                6.1 +/-    0.82       6.2 +/-    0.82  0.240 / 0.360