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As I worked more closely with those Greek texts in which expanded letter spacing is used for emphasis, it occurred to me that the print-image Greek font has neither italics nor bold, but the Greek font used in the electronic pages has both available. It would not be burdensome for me to bold the spread texts (I tried it in the "corrections" format using ctrl-b). Indeed, where the Greek matches to italicized English or Latin in the two-column displays, I could easily italicize that Greek; but that would be to "improve on" the print image, which I understand we're not supposed to do!
Given a hint as to how to pass this not-so-sticky wicket, I should be able to proof the chapter I am working with in short order.
Incidentally, the electronic text of Schaff's Creeds of Christendom which I have proofed so far is pretty clean. I even found that the one "obvious mistake" I encountered (missing rough breathing in one instance of "ημετέρας") is an exact rendering of a print-image error -- to be left as is!