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I'm working on my first set of true small caps. I see that in a few fonts the small caps are a little taller than x-height, although theoretically they should be the same as the x-height. Are there any guidelines for this? I can see how it might be helpful if a font had a smallish x-height (mine is average). For my first version I made the stems of the small caps the same thickness as those of the lowercase letters, but I think this is not quite enough. I'd be grateful for any pointers on this topic.