PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-21:12:40
G10     252.6          27.4               16.3 +/-    1.80      30.1 +/-    1.80  0.120 / 0.290
G13     52.6           30.1               13.7 +/-    0.79      23.9 +/-    0.79  0.110 / 0.300
G15     82.2           56.9               14.7 +/-    0.62      17.2 +/-    0.62  0.040 / 0.040
G16     297.0          13.9               12.6 +/-    1.45      32.2 +/-    1.45  0.040 / 0.050
G18     272.9          57.5               16.1 +/-    0.98      18.7 +/-    0.98  0.080 / 0.270
G20     44.5           46.4               13.5 +/-    0.58      17.8 +/-    0.58  0.070 / 0.300
G21     338.7          62.9               16.0 +/-    0.78      17.8 +/-    0.78  0.080 / 0.180
G26     269.4          14.4               14.1 +/-    1.32      35.7 +/-    1.32  0.080 / 0.160
G29     163.5          42.9               16.6 +/-    0.89      23.1 +/-    0.89  0.040 / 0.080