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Hello Daniel--

> 
> i try to run simulated annealing with a n- and c-terminal protected
> peptide.
> I managed to get the .psf file but the template generation is aborting
> with the following error.
> 
> 
> %CODIMP-ERR: missing improper parameters %%%%%%%%%%%%%%%%%%%%%
>   improper energy constant missing.
>   target improper value missing.
>   periodicity missing.
>   ATOM1: SEGId="    ",  RESId="143 ",  NAME="HA1 ",  CHEMical="HA  "
>   ATOM2: SEGId="    ",  RESId="143 ",  NAME="HA2 ",  CHEMical="HA  "
>   ATOM3: SEGId="    ",  RESId="143 ",  NAME="C   ",  CHEMical="C   "
>   ATOM4: SEGId="    ",  RESId="143 ",  NAME="HA3 ",  CHEMical="HA  "
>  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>  %CODIMP-ERR: program will be aborted.
>  
> So i guess these data are missing in some file.
> This is the ACE group. I did see it listed in the protein.top file, so
> why do the parameter miss ?

are you using toppar/protein.par for the parameters? The parameters for
this improper is defined in that file.

best regards--
Charles
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