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Ijon Tichy, you should write the manual! Your explanations is much clearer. Thank you again!

MisterArtC

Thanks for the helpful responses. However I am still not quite getting what I want.

First, I didn't know about the "lines" option in the Grid package because I've used Grid in some other projects and never had a problem. A better solution for me, instead of adding "lines=57" (or whatever) was to ...

I am struggling to get the page headers I want in a scrbook document class (2-sided, 2 cols).

I want no header on the first (right/odd) chapter page, and the page number should be bottom-center.

Otherwise, the header should have a line underneath and a space (baselineskip) after that dividing the ...