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about label_region

hi, there,

Yesterday, I post a message. Since it has the same subject of the
previous one. It got confused. So I bother to post it again. Wish I
can get good results.

The ones who used label_region in IDL must be suprised at the
efficieny of this function. But how can I find out what algorithm is
used in LABEL_REGION? Since I do not see this function in the library,
I assume it is written in C somewhere.