PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/21-12:12:40
G01     122.0          15.5                5.6 +/-    1.18      13.6 +/-    1.18  0.030 / 0.040
G07     75.8           65.8                4.2 +/-    0.72       4.5 +/-    0.72  0.030 / 0.040
G08     46.1           32.8                3.3 +/-    0.27       5.5 +/-    0.27  0.030 / 0.030
G09     175.3          27.4                6.3 +/-    0.90      11.8 +/-    0.90  0.030 / 0.040
G11     108.6          37.0                5.9 +/-    0.91       9.0 +/-    0.91  0.130 / 0.420
G13     320.2          14.5                1.6 +/-    3.06       4.0 +/-    3.06  0.110 / 0.560
G17     200.1          23.2                5.4 +/-    1.85      11.0 +/-    1.85  0.120 / 0.150
G28     286.6          55.8                4.5 +/-    1.30       5.3 +/-    1.30  0.070 / 0.180
G30     337.9          63.7                3.6 +/-    0.68       4.0 +/-    0.68  0.110 / 0.180