code: private void resetMomentObservation() {
  		if (momentObservation.isEmpty()) {
  			Observation o;
  			for (int i : momentDegrees) {
  				o = new Observation("moment "+i, true);
  				o.setStandardPrecision(momentPrecision);
  				momentObservation.put(i, o);
  			}
  		} else {
  			for (Observation o : momentObservation.values())
  				o.reset();
  		}
  	}
docs: Resets the moment observations.<br>
  If there are no observations yet, new observations are created and added to the map.<br>
  Otherwise existing observations are reset.