If you would like to do more advanced graphing, you can do this using the Export function of the Hyperion EOS Control & Data Suite.

Under the Charge statistics module you can select a charge and press "Export selected"

This will give you the option to export to XML format (readable by Excel 2007 and later) or TAB delimited Text file (which you can read into any graphing program, like the Logviewer which can be found here: http://www.logview.info/cms/d_download-logview.phtml)

If you have knowledge of SQL language, the data itself is stored in a SQLite database under <my documents>\hyperion\EOSLogging.s3db

SQLite: http://www.sqlite.org/