11.7.1 Syntax of an Atom-Selection

     atom-selection ::= repeat(token)

where token can be:

     SHOW
     ALL
     *

     [ ATOM ] segid* resid* atomname*
     [ CELL ]

     RESName resname*
     RAMA    resname* atomname*
     RANGe   segid1 resid1 atom1     segid2 resid2 atom2
     RANGe BYNUm integer integer
     BYNUm repeat(integer)
     AROUnd  real

                    {GE}
                {X} {GT}
     COOR [ABS] {Y} {LE} real
                {Z} {LT}
                    {EQ}
                    {NE}

     CONT probe cutoff
     SURF probe cutoff
     CLEAR
     BYREs
     ENTEr
     OR
     AND
     NOT
     EXCL
     EXCH int