PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-13:57:50
G01     128.2          10.5               -8.8 +/-   44.43     -24.1 +/-   44.43  0.190 / 0.350
G07     56.2           67.8                7.4 +/-    0.45       8.0 +/-    0.45  0.130 / 0.290
G08     51.1           39.2               -8.0 +/-   16.20     -11.8 +/-   16.20  0.050 / 0.040
G09     177.0          36.8               10.2 +/-    1.50      15.7 +/-    1.50  0.040 / 0.050
G11     116.9          33.0                9.5 +/-    0.71      15.7 +/-    0.71  0.050 / 0.120
G17     199.0          15.3                7.4 +/-    3.94      18.2 +/-    3.94  0.060 / 0.110
G23     161.0          10.7                8.4 +/-    3.38      23.1 +/-    3.38  0.030 / 0.040
G28     273.7          51.8              -57.7 +/-   61.30     -71.3 +/-   61.30  0.020 / 0.040
G30     328.2          56.7                6.0 +/-    0.66       7.0 +/-    0.66  0.090 / 0.280