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Thanks that helped. For other noobs (like me), here some filling-in of blanks:

Before your \begin{document}, put this (or something like it):

\usepackage{array}
\newcolumntype{+}{>{\global\let\currentrowstyle\relax}}
\newcolumntype{^}{>{\currentrowstyle}}
\newcommand{\rowstyle}[1]{\gdef ...

That seems messy indeed. And with me it doesn't work, I'm getting:

! Undefined control sequence.
l.516 \newcolumntype
{^}{>{\currentrowstyle}}

I tried putting those commands before my \begin{document} and after - both times with the same error (except for the line number). And as I don't really ...