PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-13:27:40
G07     43.4           68.4                7.8 +/-    0.72       8.3 +/-    0.72  0.030 / 0.040
G08     54.7           42.4                5.9 +/-    1.84       8.2 +/-    1.84  0.030 / 0.040
G09     177.2          41.3                2.0 +/-   11.78       2.8 +/-   11.78  0.120 / 0.240
G11     121.3          30.6                6.4 +/-    2.70      11.0 +/-    2.70  0.110 / 0.270
G17     198.6          11.2               -1.8 +/-   18.52      -5.0 +/-   18.52  0.140 / 0.300
G23     160.9          14.8                7.5 +/-    3.39      18.7 +/-    3.39  0.160 / 0.280
G27     38.1           11.2                5.7 +/-    1.72      15.5 +/-    1.72  0.030 / 0.040
G28     267.5          49.4              -33.7 +/-   61.29     -42.8 +/-   61.29  0.050 / 0.050
G30     324.0          53.3                7.6 +/-    0.96       9.2 +/-    0.96  0.160 / 0.270