docs: public void unsetStandardDeviation() {
  		double oldStandardDeviation = standardDeviation;
  		boolean oldStandardDeviationESet = standardDeviationESet;
  		standardDeviation = STANDARD_DEVIATION_EDEFAULT;
  		standardDeviationESet = false;
  		if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.UNSET, BpsimPackage.LOG_NORMAL_DISTRIBUTION_TYPE__STANDARD_DEVIATION, oldStandardDeviation, STANDARD_DEVIATION_EDEFAULT, oldStandardDeviationESet));
  	}