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* Tutorials
** https://wiki.nbic.nl/index.php/R_ggplot2_tutorial

* remove the grey background of all graphs: theme_set( theme_bw() )
* replot the last graph: last_plot() + modificationsYouWantToAdd

* Data 
** you can subset the dataframe, but then you need to do something like d$category = drop.levels(x, reorder=F, ...) (gdata package)

Return to Ggplot2.

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