close all
clf
x = 1:3;
[hax,h1,h2]=plotyy(x,2:4,x,6:-1:4);
hold on
[~,h3,h4]=plotyy(x,3:5,x,5:-1:3);
h5=plot(hax(2),x,5:7);
set(h1,'color','r')
set(h2,'color','g')
set(h3,'color','b')
set(h4,'color','m')
set(h5,'color','c')
hl = legend([h1,h2,h3,h4,h5],'2-4 red','6-4 green','3-5 blue','5-3 magenta','5-7 cyan');
set(hl,'fontsize',14)