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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@rhowe
You can manipulate rrd files with rrdtool: http://oss.oetiker.ch/rrdtool/
rrdtool has built in support for generating graphs and you can get a dump in its proprietary XML format with 'rrdtool dump file.rrd'.
It's a pretty powerful, fairly inpenetrable tool with the bonus of reverse polish notation!