what does "patch" mean?

From: xiaojing gong (gongxiaojing1981_at_yahoo.com.cn)
Date: Sun Mar 19 2006 - 20:04:25 CST

Dear all,
           I read the user's guide, there is a sentence :
  The pairlistdist parameter is also used to determine the minimum patch size.
          I don't quite understand what the "patch" mean?
  Couls anyone give me some suggestions?


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