Frealign STIFFNESS parameter

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Dear FREALIGN developers,

I'm trying helical refinement with frealign (V9.11 build on 151031), and now I need a conclusion about the STIFFNESS parameter.

In the default mparameters file produced by frealign_helical_template, the STIFFNESS parameter is explained as 'Stregth of straightness restraint (small value = strong restraint).'.

But in README.txt (included in frealign_v9.11), and also in some past posts in this forum, the STIFFNESS parameter is explained as the opposite (small value = weak restraint).

Could you tell me which is correct? I will appreciate your help.

Regards,
Kotaro Tanaka

Small values (e.g. 1) of STIFFNESS impose a weak restraint: parameters along the filaments are allowed to vary more.
Large values (e.g. 50) of STIFFNESS impose a strong restraint: parameters along the filaments are allowed to vary less.