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ICIRCLE
Select a circular subset of the image for further use. Where
applicable and sensible, subsequent commands will act only on the
pixels within the circle. The circle is specified by its centre and
radius, either by cursor or parameter, depending on the current mode
(change mode with command IMODE). The circle selected is displayed
on the image.
Note that after using ICIRCLE, subsequent commands will act only
on the data within the circle (eg ISTATS) or the box containing
the circle (eg. IDISP) as appropriate. To use this command
purely for marking circles, follow it with IWHOLE to switch off
the selection.
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