Exact plot colour change???

I made 6 subplots, 6th is combination of 1st to 5th. How to make plot colour on 1,2,3,4,5th subplot to match colour on 6th subplot? Here are subplots:

subplot(2,3,1), plot(X,Y1)
subplot(2,3,2), plot(X,Y2,'g')
subplot(2,3,3), plot(X,Y3)
subplot(2,3,4), plot(X,Y4)
subplot(2,3,5), plot(X,Y5)
subplot(2,3,6), plot(X,Y1,X,Y2,X,Y3,X,Y4,X,Y5)
legend ('0.5Eu','3Eu','7Eu','10Eu','12Eu')

[Image Analyst]

I fixed your formatting for you. Here's how you can do it next time: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup