how to get rid of colorbar in raster images

I am trying to get rid of the colorbar that shows up to the right of raster
image plots.

For instance, if I type the following:

data(lansing)
D <- density(lansing)
plot(D)

it always shows up with a colorbar at the right hand side.  I would like to
delete that colorbar.

does anyone have a suggestion as to how?  I have searched high and low for
this, so far unsuccessfully.

thank you, Paul



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