docs: public SwaptionDataLattice append(SwaptionDataLattice other, AnalyticModel model) {
  
  		SwaptionDataLattice combined = new SwaptionDataLattice(referenceDate, quotingConvention, displacement,
  				forwardCurveName, discountCurveName, floatMetaSchedule, fixMetaSchedule);
  		combined.entryMap.putAll(entryMap);
  
  		if(quotingConvention == other.quotingConvention && displacement == other.displacement) {
  			combined.entryMap.putAll(other.entryMap);
  		} else {
  			SwaptionDataLattice converted = other.convertLattice(quotingConvention, displacement, model);
  			combined.entryMap.putAll(converted.entryMap);
  		}
  
  		return combined;
  	}