Elena wrote: > I'm not aware of those internals. I was speaking of duplicate patches because > sometimes (depending on the print process) the same patch printed at extreme > left or extreme right may be slightly different. It's clear. But... I suppose the several different, close placed in device space patches may be better for profiling than the same amount but duplicated, but not so close placed patches. The only thing must be kept: the randomized placing of patches on the target, IMHO. There Graeme opinion is essential.