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Potbelly raised its estimated IPO price range to $12-$13 a share, up from a previous view of $9-$11. The fast-casual restaurant chain expects to raise $83.9 mil, up 25% from the prior expectation of $67 mil, after deducting IPO expenses and commissions. It is selling 7.36 mil shares of common stock that are expected to price Thursday evening, with the ticker PBPB.