I hope it's at least a little bit more clear now?

It is, thank you. I struggle with the map {sub{\@_}->(...)} syntax, but can imitate it and know where to find it now. Indeed, I wasn't really grasping it until happening on the thread where davido, you, and others comment on the parameter array referring to other source: Re: passing a hash ref in a sub

I like how the monastery can solve one's questions with deeper reading and cross-referencing nodes that carry a topic forward instead of beating it to death in one thread with one example....

In reply to Re^5: Selecting Ranges of 2-Dimensional Data by Aldebaran
in thread Selecting Ranges of 2-Dimensional Data by haukex

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