Reverting to original values of image_viewer

[Alasdair McAndrew]

If I change image_viewer from the default use of gnuplot to ImageMagick's
"display" function, with

image_viewer("display %s")

how do I revert to using gnuplot again for image display - what function
call do I need here?

Thanks,
Alasdair

-- 
Blog: http://amca01.wordpress.com
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