clear; 
clf;
figure('Color',[0.8 0.8 0.8], 'HandleVisibility','on', ...
        'Position',[427 134 550 550], 'Tag','Medium');
 load a1.dat
 load b1.dat
 load c1.dat
plot(a1,b1,'-k',a1,c1,':k'), hold on

 load a2.dat
 load b2.dat
 load c2.dat
plot(a2,b2,'-r',a2,c2,':r'), hold on

 load a3.dat
 load b3.dat
 load c3.dat
plot(a3,b3,'-b',a3,c3,':b'), hold off

% load a4.dat
% load b4.dat
% load c4.dat
%plot(a4,b4,'--k',a4,c4,'+k'), hold on
