[R] Graphing Significant difference

[BrightK]

I am new to R and would appreciate help in dealing with this problem.

I worked on a some African grasses and have a  matrix based on TukeyHSD test
showing how the species differ from each other. A value of 1 means they
DON't differ significantly from each other, whiles 0 means they differ
significantly from each other.

I want to assign letters to these combination and show them on a histogram.
How to I go about this. I attach the file to the mail and look forward to
hearing for you http://www.nabble.com/file/p24697164/R-request-Bright.xls
R-request-Bright.xls .

Bright 
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