[Xy-pic] Bigger xypic arrow tips

[Frank Moore]

Hi all,

New lister here, but long time user of xypic.  I am trying to use xypic with
the beamerposter package.  The poster package scales all the fonts and
symbols fine, but the arrow heads are not scaled properly.  Is there any way
to manually set the size of the arrow tips in xypic (above 12 pt?)

Thanks in advance,

Frank
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