code: private Map<PhysicalEntity, Stoichiometry> getStoichiometry(Conversion conv) {
  		Map<PhysicalEntity, Stoichiometry> map = new HashMap<PhysicalEntity, Stoichiometry>();
  
  		for (Stoichiometry stoc : conv.getParticipantStoichiometry())
  			map.put(stoc.getPhysicalEntity(), stoc);
  
  		return map;
  	}
docs: /*
  Gets the map of stoichiometry coefficients of participants.
  @param conv the conversion
  @return map from physical entities to their stoichiometry