A tablespoon is a measure of volume, an ounce is a measure of weight so the two aren't really officially comparable.
However, you can be pretty close with butter since a pound (weight) is two US cups (volume). There are 16 tablespoons in a cup which is about 8 oz. of butter. Therefore a tablespoon is a half ounce, 6 tablespoons would then be 3 oz. approximately.
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