Unset pm3d map in gnuplot

I know I can make a color map of a splot with

set pm3d map

but how can I unset this option?

unset pm3d map

gives an error and

uns开发者_高级运维et pm3d
unset map

both result in an splot with a fixed "top-down" view, making it impossible to see anything.

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Should unset the view variable, use

unset view

also would be useful to

unset pm3d

should be back again to normal if you are using GNU Plot 4.x :)