clear
%just need a test datum.
% x=linspace(0,2*pi,100);
% y=sin(x);
% plot(x,y);

%uiopen('..\good.fig',1);
h_a=get(gcf,'Children');
%mybe  U have double axes!
%don't use : h_a=gca;
h_line=get(h_a,'Children');%get line handles

%if U have text objects,try:
get(h_line,'Type');
%ok get your original data!
xdata=get(h_line,'Xdata');
ydata=get(h_line,'Ydata');