gnuplot: key magic

All info about key: www.gnuplot.info

positioning key

 set key top left

top/bottom/centerleft/right

justification of the text

 set key Left

Left or Right (Default)

small tricks

 set key reverse            ## reverse text and sample

 set key samplen <length>   ## change length of samplen

 set key spacing <spacing>  ## set spacing between key lines