code: public void addAxis(Matrix4d axis, int order, SymmetryType type) {
  		axes.add(new Axis(axis,order,type,axes.size(),0));
  	}
docs: Adds a new axis of symmetry to the bottom level of the tree
  
  @param axis the new axis of symmetry found
  @param order number of parts that this axis divides the structure in
  @param type indicates whether the axis has OPEN or CLOSED symmetry