load your .fig file
execute
>saveas(gcf,'mydata','mmat')
>clear all
>load 'mydata'
The object variable 'mat' now contains all your data. To extract it from it, do
>x1=mat{1}
>y1=mat{2}
....
if you have n panels, the data from panel n will be retrieved by doing
>xn=mat(2*n-1); yn=mat(2*n)
Now, you have all your data in the pairs of variables (xi, yi)
Enjoy!