Get the latest version of flot (currently 0.8.3).
There are some changes starting with version (0.6) that support IE9, in particular, a way to support IE6-8 canvas through a library called excanvas . IE9 now supports canvas natively, so excanvas should only be enabled if the user does not have IE9. A specific change to the subversion repository for the fleet is:
http://code.google.com/p/flot/source/detail?r=293
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