There is a tradition that certain instances of specific letters in STAM are written larger (e.g. the “ב” in בראשית) or smaller (e.g. the “א” in ויקרא) than the rest of the text. The larger letters should be noticeably larger, and the smaller letters should be noticeably smaller. A STAM item which does not have the relevant letters enlarged or reduced, although written improperly, is still kosher.
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STAM 101 introduction & index
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More about large & small letters