This is MetaPost, version 1.504 (kpathsea version 6.1.0dev)  16 MAY 2012 17:07
**smtau
(mpost.mp (/usr/share/texlive/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.004)) (./smtau.mp
(/usr/share/texmf/metapost/feynmf/feynmp.mp) [1] )
 
Here is how much of MetaPost's memory you used:
 454 strings using 6813 characters
 824136 bytes of node memory
 917 symbolic tokens
 14i,71n,28p,103b,3f stack positions out of 16i,84n,32p,200b,4f
1 output file written: smtau.1