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Biogen (BIIB) vs Pfizer (PFE) vs Perrigo (PRGO) vs Elan (ELN) vs S&P500

http://finance.yahoo.com/echarts?s=BIIB+Interactive#symbol=biib;range=1y;compare=^gspc+pfe+prgo+eln;indicator=volume;charttype=area;crosshair=on;ohlcvalues=0;logscale=off;source=;