[gmx-users] how to constrain the distance between two dummy atoms

[コウ チ]

hello:
 i want to constrain the distance between two dummy atoms and i defined it 
in the .top file with
 [ constraints ]
,dummy 1 dummy2 2 distance
then i go to creat a .tpr file but an error occoured that is 
 Cannot have constraint 1 2 with dummy atom  
 how can i do it ?
 regards                                                                    
            caoch

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