dummy atom mass changed

From: yun luo (luoyun724_at_gmail.com)
Date: Mon May 04 2009 - 14:54:27 CDT

Hi,

I'm using NAMD2.7 for running FEP. I need to disappear a sodium ion in my
membrane. So I overlay a dummy atom with 0 mass 0 charge 0 radius on a
sodium ion. But I got a warning below:

Warning: FOUND 1 ATOMS WITH ZERO OR NEGATIVE MASSES! CHANGED TO 0.001

I'm wondering if the nonzero mass will effect the energy? If yes, how to
stop this automatic changing?

Thanks!

Ly

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