PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-11:58:00
G01     128.8          10.1              -17.8 +/-   21.67     -49.5 +/-   21.67  0.020 / 0.030
G07     52.4           68.3                3.2 +/-    0.56       3.4 +/-    0.56  0.030 / 0.030
G08     51.5           39.7                3.7 +/-    0.91       5.4 +/-    0.91  0.110 / 0.270
G09     176.1          36.3                5.9 +/-    1.34       9.2 +/-    1.34  0.140 / 0.260
G11     118.2          32.8                5.0 +/-    0.93       8.2 +/-    0.93  0.040 / 0.040
G17     198.9          14.7                3.2 +/-    2.99       8.1 +/-    2.99  0.030 / 0.050
G23     161.1          11.5                3.6 +/-    1.82       9.7 +/-    1.82  0.180 / 0.430
G28     272.9          51.6                4.0 +/-    1.00       5.0 +/-    1.00  0.180 / 0.290
G30     328.0          56.6                2.6 +/-    0.67       3.0 +/-    0.67  0.110 / 0.250