PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/23-09:57:40
G01     122.1          15.5                3.8 +/-    2.01       9.4 +/-    2.01  0.160 / 0.290
G07     74.2           66.5                6.4 +/-    0.57       6.9 +/-    0.57  0.110 / 0.320
G08     46.2           33.0                3.9 +/-    1.89       6.4 +/-    1.89  0.040 / 0.030
G09     176.1          28.4                6.6 +/-    2.22      12.0 +/-    2.22  0.030 / 0.020
G11     109.5          37.2                7.4 +/-    0.75      11.3 +/-    0.75  0.030 / 0.030
G13     320.2          14.5                3.8 +/-    3.18       9.4 +/-    3.18  0.020 / 0.030
G17     200.2          23.0                6.2 +/-    2.82      12.6 +/-    2.82  0.200 / 0.150
G28     286.8          56.0                5.5 +/-    2.48       6.5 +/-    2.48  0.340 / 0.180
G30     339.0          64.3                5.5 +/-    0.85       6.1 +/-    0.85  0.150 / 0.220