Ah! Sorry.
(I do use small images for publisher's colophon -- one of them a Chinese character, in fact -- and I once used a hand-drawn sunburst as a section break in a novel. I kept the physical dimensions small. Worked great on the KF8 devices, acceptable (though just barely) on the old KF7 devices. I am less certain about IOS, though they look fine on my iPhone 4.)
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