| Adding to Cushing 30 MLP index finance.yahoo.com
 
 DALLAS, Sept. 6, 2011 /PRNewswire/ -- Swank Capital, LLC and Cushing® MLP Asset Management, LP announced today that Atlas Pipeline Partners, L.P. (NYSE: APL -  News) will replace Duncan Energy Partners L.P. (NYSE: DEP -  News) after the close of trading on Wednesday, September 7, 2011.
 
 Atlas Pipeline Partners, L.P. is engaged in the gathering and processing of natural gas and the transportation of natural gas liquids in the Mid-Continent region of the United States.
 
 The Cushing® 30 MLP Index tracks the performance of 30 publicly traded MLP securities that hold midstream energy infrastructure assets in North America, chosen according to a proprietary fundamental scoring model developed by Cushing® MLP Asset Management, LP to rank potential MLPs for inclusion in the Index.  The Cushing® 30 MLP Index is calculated by Standard & Poor's and reported on a real-time basis under the Bloomberg ticker "MLPX" and FactSet ticker "MLPX-CME".
 
 Expected MLPX Index Constituents: APL, ARLP, APU, BWP, BPL, CPNO, EPB, EEP, ETE, ETP, EPD, GEL, NRGY, KMP, MMP, MWE, NRP, NKA, NS, NSH, OKS, PAA, RGNC, SEP, SXL, NGLS, TCLP, TRGP, WES, WPZ.
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