I know Excel normally ignores chart data that is in hidden rows/columns, and
I know there's the option for it NOT to ignore it (i.e. have Excel built the
chart even if the data is in a hidden row/column).

I have a spreadsheet in which data which lies in the hidden columns is
practically meaningless, but hidden rows contain numerical data which I'd
like to create graphs from, but which I'd also like to remain out of sight.
My question is, therefo is it possible for Excel to only ignore data in
hidden *columns*, but take into account data from hidden *rows*?

Anticipated thanks for your help.