code: public static void initExtinctionCoefficient(){
  		aa2ExtinctionCoefficient.put(Y, 1490.0);
  		aa2ExtinctionCoefficient.put(W, 5500.0);
  		aa2ExtinctionCoefficient.put(C, 125.0);
  	}
docs: Does the initialization of extinction coefficient based on
  http://au.expasy.org/tools/protparam-doc.html