The use of paste-up has made the eye more important in the absence of thick and thin metal "leads" (pronounced ledds), in assessing columnar space during page make-up, but the process is helped by the fact that make-up cards, as with layouts sheets, have the columns separated by a clear pica of space as well as being divided horizontally by centimetre lines measured upwards and downwards at the side to give text and advert depths.