[NTG-context] a line under the header

Hello, I would like to put a line (not [underbared]) under the header and above the footer. The line shouldn't be to thin (not so thin as \hairline) and it would be nice, if I could have a coloured line (grey, red, whatever). A small example, so something like this (best view with non proportional font): header pagenumber ------------------------------------------- text text text text text text text text text text text text text text text text text text text text text text ----------------------------------------- footer footer Thanks for any help, best wishes, Helmut