code: public void removeInterfacesBelowArea(double area) {
  
  		list.removeIf(interf -> interf.getTotalArea() < area);
  
  	    if (clustersNcs != null) {
  	    	clustersNcs.removeIf(ncsCluster -> ncsCluster.getMembers().get(0).getTotalArea() < area);
          }
  	}
docs: Removes from this interface list all interfaces with areas
  below the given cutoff area.
  Note that this must be called after {@link #calcAsas(int, int, int)}, otherwise all areas would
  be 0 and thus all removed.
  @param area the minimum interface buried surface area to keep. Interfaces below this value will be removed.