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However, this takes up a lot of the space preceding a capitalized word in running text.
Therefore, a contextual adjustment should be applied. But what?
1. Substitute a wider space (eg en-space character) prior to accented caps.
2. Add positive kerning between regular space and accented cap.
Some applications, of course, ignore the space character, and substitute a layout-level value. (e.g. CCI newspaper pagination system). How much of an issue is that for setting Polytonic -- can one assume that the users of Opentype Polytonic fonts will have Quark 7 and InDesign CS?