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                  CONN_FILE_FORMAT {Keyword} | 
               
               
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                  Ways to determine and generate a molecules. Default is to use GENERATE | 
               
               
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                     This keyword cannot be repeated
                     and it expects
                     
                     precisely one keyword.
                     
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                     Default value:
                     PSF | 
               
               
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                     List of valid keywords:
                     
                     
                        - 
                           
                              AMBER 
                              - Use AMBER topology file for reading connectivity (compatible starting from AMBER V.7)
 
                            
                         
                        - 
                           
                              G87 
                              - Use GROMOS G87 topology file.
 
                            
                         
                        - 
                           
                              G96 
                              - Use GROMOS G96 topology file.
 
                            
                         
                        - 
                           
                              GENERATE 
                              - Use a simple distance criteria. (Look at keyword BONDPARM)
 
                            
                         
                        - 
                           
                              MOL_SET 
                              - Use multiple PSF (for now...) files to generate the whole sytem.
 
                            
                         
                        - 
                           
                              OFF 
                              - Do not generate molecules. (e.g. for QS or ill defined systems)
 
                            
                         
                        - 
                           
                              PSF 
                              - Use  a PSF file to determine the connectivity. (support standard CHARMM/XPLOR and
                                    EXT CHARMM)
 
                            
                         
                        - 
                           
                              UPSF 
                              - Read a PSF file in an unformatted way (useful for not so standard PSF).
 
                            
                         
                        - 
                           
                              USER 
                              - Allows the definition of molecules and residues based on the 5th and 6th column of
                                    the COORD section. This option can be handy for the definition of molecules with QS
                                    or to save memory in the case of very large systems (use PARA_RES off).
 
                            
                         
                      
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                     Alias names for this keyword:
                     CONNECTIVITY
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