Hi Laura

If you want an example of the maths for these  have a look at


<https://nmr.cit.nih.gov/xplor-nih/doc/current/xplor/node385.html>
Soft-Square 
Function<https://nmr.cit.nih.gov/xplor-nih/doc/current/xplor/node385.html>
cit.nih.gov<https://nmr.cit.nih.gov/xplor-nih/doc/current/xplor/node385.html>
[X]<https://nmr.cit.nih.gov/xplor-nih/doc/current/xplor/node385.html>

I am not sure if they are exactly the function you are using as you don’t say 
which it is. Note as far as I understand it the value of rswitch is generally 
configured to be a nice value to give a smooth potential. Ie its not optimal, 
people just played around with the maths till it looked good and then have just 
used that value from then onwards

regards
Gary

Dr Gary S Thompson NMR Facility Manager
Wellcome Trust Biomolecular NMR Facility
CCPN CoI & working group member
School of Biosciences,  Division of Natural Sciences
University of Kent,  Canterbury,  Kent,  England,  CT2 7NZ

☎:01227 82 7117
✉️: [email protected]
orchid: orcid.org/0000-0001-9399-7636

On 27 Feb 2024, at 14:33, Charles Schwieters <[email protected]> wrote:

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Hello Laura--


I am Laura Rigobello, a PhD student of the University of Bologna. I am using
XPLOR for my analysis. In my script, below the noe statement, there are some
parameters defining the distance symmetry restrains. I know the role of most
of these parameters, but I can't find anywhere the function of the "mrswitch"
and "masymptope" parameters. Do you know which is the function of
"mrswitch" and "masymptope" parameters?


mrswitch seems to be rswitch parameter for switching to the asymptotic
region for distances on the short side of the ``square well,'' while
masymptope should be the asymptotic slope for small distance.

Do note that these parameters are associated with the NOE term in the
old XPLOR interface, which has been largely superseded by the NOEPot
term in the Python interface. This later term's ``soft'' potType has
no linear region for small distance.

best regards--
Charles

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