* @param specInfo
	 * @return bitset; null only if we mess up with name
	 */
	BitSet getAtomBits(String setType, int specInfo) {
		if (setType.equals("SpecResid"))
			return getSpecResid(specInfo);
		if (setType.equals("SpecSeqcode"))
			return getSpecSeqcode(specInfo, true);
		if (setType.equals("SpecChain"))
			return getSpecChain((char) specInfo);
		if (setType.equals("atomno"))
			return getSpecAtomNumber(specInfo);
		return null;
	}