What is the exact form of the harmonic potential used by the NAMD "constraints" option?

From: Victoria Lim (limvt_at_uci.edu)
Date: Tue Sep 19 2017 - 01:37:21 CDT

Dear NAMD users,

Do the harmonic restraint parameters specified by the "constraints" option
contain the factor of one half in the harmonic potential? I realize the
"extraBonds" option does *not* contain this factor, whereas the harmonic
potential in the colvars module does have the 1/2. However, I could not
find an explicit formula for the constraints option.

Thank you,

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