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| elevation<-convert |
|int]*,
height=[int], colour=[{hilited,reduced}|colour|pixmap],
relief=[colour|pixmap], shadow=[colour|pixmap],
kind=[{3d,shadow}], background=[{reduced}|colour|pixmap] -> elevation|int -> elevation<-convert
and elevation<-lookup
methods realise reuse of elevation
objects from the @elevations
table.