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How to draw a graph like this to display the similarity between sequence? - (Jan/24/2007 )

Hi everybody :
Iwant to draw a graph like the picture in the attachment to display my data, but i don't know how to draw it ? who can help me ?
I only need different colour display different similarity gradationally .
Thanks !
Another question is i can't paste the picture in this post ??????
Thanks very much !!!
the figure also can be find at here.


If you know some perl, you can write a simple script using the perl GD module found here


But I am bot familar with the perl programming.
I am tring to do it by GnuPlot!
I don't know whether it is useful ?