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NEW YORK ( TheStreet) -- The ex-dividend date for Southwest Gas Corporation (NYSE: SWX) is tomorrow, May 11, 2012. Owners of shares as of market close today will be eligible for a dividend of 30 cents per share. At a price of $42.89 as of 9:30 a.m. ET, the dividend yield is 2.8%. The average volume for Southwest Gas has been 183,100 shares per day over the past 30 days. Southwest Gas has a market cap of $1.97 billion and is part of the utilities sector and utilities industry. Shares are up 0.3% year to date as of the close of trading on Wednesday. Southwest Gas Corporation engages in the purchase, distribution, and transportation of natural gas in Arizona, Nevada, and California. As of February 28, 2012, it had 1,859,000 residential, commercial, and industrial customers. The company has a P/E ratio of 15.6, below the average utilities industry P/E ratio of 17.6 and below the S&P 500 P/E ratio of 17.7.