How to denote letters to mark significant differences in a bar chart plot -> Attachments

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	Attachment	Size:	Post #
	file.PostFileLoader (1).jpg ( downloads: 77 ) ( Posted on Dec 25 2012 04:00 AM )	17.78K	147117
	file.PostFileLoader (3).jpg ( downloads: 69 ) ( Posted on Dec 25 2012 04:01 AM )	26.87K	147117