[lattice] print only legend

Is it possible to plot (and save) only the legend of a lattice plot? Of
course I could make the axes and axis labels transparent and use an empty
panel function, but additionally to being a very "dirty" solution, there
would be still a lot of free space on the plot, while I would like to save
only the legend as a separate plot without any white space around it. Is
there a (nice) way to do this?



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