What's the difference between upperboundary and upperwall?

From: DAI, JIAN (jdai2_at_fsu.edu)
Date: Mon Dec 03 2012 - 16:34:32 CST

Dear all:
Can someone tell me the difference between these two parameters and what is the actual consequence of changing these parameters? For example, constraining a distance using
upperboundary 6.0 and
upperwall 6.0
what is the difference?
Thank you.

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