Has anybody got any recommendations for creating chromaticity graphs in Excel? I'm looking for a simple, configurable way to create them in Excel, using either the built-in tools or a plug-in. I don't mind buying one as long as it is resonably priced. Here's the sort of thing I'm looking to create: http://en.wikipedia.org/wiki/Image:CIExy1931_sRGB.svg
This would be for a mixed Excel 2004/2008 environment, all running under MacOS X 10.4/10.5.