code: public static final Atom[] getAtomArrayAllModels(Structure s,
  			String[] atomNames) {
  
  		List<Atom> atoms = new ArrayList<Atom>();
  
  		for (int i = 0; i < s.nrModels(); i++) {
  			List<Chain> chains = s.getModel(i);
  			extractAtoms(atomNames, chains, atoms);
  		}
  		return atoms.toArray(new Atom[atoms.size()]);
  
  	}
docs: Returns an array of the requested Atoms from the Structure object. In
  contrast to {@link #getAtomArray(Structure, String[])} this method
  iterates over all chains. Iterates over all chains and groups and checks
  if the requested atoms are in this group, no matter if this is a
  {@link AminoAcid} or {@link HetatomImpl} group. If the group does not
  contain all requested atoms then no atoms are added for that group. For
  structures with more than one model, only model 0 will be used.
  
  @param s
  the structure to get the atoms from
  
  @param atomNames
  contains the atom names to be used.
  @return an Atom[] array