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  • I finally found something that looks decent. Using the bm package you can thicken the arrow out with \overset{\text{\tiny$\bm\leftrightarrow$}}{#1} Commented Apr 17, 2013 at 1:08
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    Welcome to TeX.sx! You can also edit your answer instead of commenting on it. Commented Apr 17, 2013 at 1:12