Investors are getting a deep dive look at the supermarket sector this week. Shares of Safeway (SWY) early Wednesday briefly hit the highest level since June 2011 after it forecast 2013 profit above Wall Street's target, though they later pulled back in sync with a sector retreat. The Fresh Market (TFM) plunged 10% after it reported disappointing fourth-quarter earnings before the market opened. Meanwhile, grocery giant Kroger (KR), with about $94