OK, I'm going to ask what may be a dumb question: how do I measure my pan to see what size it is? This may actually not be as ridiculously simple-minded as you might think, because when I measure the top open side, Just inside the lip, it is 9.25" x 5". But when I measure the bottom of the pan, it is 8.5" x 4.375". So would this be a '9x5' pan or an '8.5x4.5' pan?

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