PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/15-10:27:40
G07     311.8          49.4                4.2 +/-    0.89       5.3 +/-    0.89  0.030 / 0.020
G08     123.0          42.3                4.8 +/-    0.85       6.8 +/-    0.85  0.030 / 0.020
G09     287.6          83.2                7.9 +/-    0.56       7.9 +/-    0.56  0.040 / 0.050
G16     42.0           24.6                3.8 +/-    1.24       7.5 +/-    1.24  0.030 / 0.050
G23     145.6          63.8                5.5 +/-    0.93       6.0 +/-    0.93  0.030 / 0.040
G27     75.6           36.6                4.5 +/-    0.76       6.9 +/-    0.76  0.030 / 0.040
G28     225.1          14.3                4.6 +/-    5.44      11.7 +/-    5.44  0.110 / 0.220
G30     286.0          21.3                4.6 +/-    2.14       9.8 +/-    2.14  0.120 / 0.260