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3.1.1 Syntax of READ Command

     READ { {RTF [PRINT]         } { FILE unit-spec   } }
          { {PARAmeter parm-opts } { CARD [unit-spec] } }
          { {IC  [APPEnd]        } {       'UNIT 5'   } }
          {                                             }
          { {SEQUence} seq-spec                         }
          { {RESIdue }                                  }
          {                                             }
          { {HBONd     } [FILE] unit-spec               }
          { {PSF       }                                }
          { {CONStraint}                                }
          { {NBONd     }                                }
          {                                             }
          { { IMAGes     } [CARD] unit-spec             }
          {                                             }
          {                      [ MAIN ]               }
          { COORdinate coor-spec [ COMP ]               }
          {                      [ DIFF ]               }
     
     unit-spec ::= UNIT unit-number
     
     parm-opts ::= [NOFAIL] [VERSION int]
     
                  [ST2  int                                                ]
     seq-spec ::= [WATEr int                                               ]
                  [[src-spec] [unit-spec] [rtf-type] [abbrev-spec] seq-opts]
     
     
     seq-opts ::= [BYATom] [IDREad] [MODEl modelid]
     
                  { CARDs                         }
     src-spec ::= { brookhaven-name [CHAIN segid]}
     
                         { BROOkhaven }
     brookhaven-name ::= { BRKHvn     }
                         { TAPE       }
     
                  { PROT }
                  { HPRO }
                  { ALLH }
     rtf-type ::= { DNA  }
                  { A94N }
                  { A94P }
     
                             {AA }
     abbrev-spec ::= [ABBREV {DNA}]
                             {RNA}
     
     coor-spec ::= { FILE unit-spec [IFILE int]       } coor-option
                   { CARD [unit-spec] [OFFS  int ]    }
                   { IGNO [unit-spec]                 }
                   { KONN [unit-spec]                 }
                   {                                  }
                   { { BROOkhaven } unit-spec brk-opt }
                   { { BRKHvn     }                   }
     
     coor-option ::= [APPEnd] [INITial] [EXPAnd]
     
                     [abbrev-spec] atom-selection
     
     brk-opt ::=  [CHAIN segid] [IDREad] [MODEl modelid]
     
                  [ALTErnate identifier] [  SEQUence]
                                         [NOSEQUence]
     

Syntactic ordering: The second field must be specified as shown.