Dear all, In the file named as lattice.xml, I have seen that for a ladder structure there is the below code: <LATTICEGRAPH name = "ladder" vt_name="LadderLattice"> <FINITELATTICE> <LATTICE ref="square lattice"/> <PARAMETER name="W" default="2"/> <EXTENT dimension="1" size="L"/> <EXTENT dimension="2" size="W"/> <BOUNDARY dimension="1" type="periodic"/> <BOUNDARY dimension="2" type="open"/> </FINITELATTICE> <UNITCELL ref="anisotropic2d"/> </LATTICEGRAPH> I am running spin_one_half.py code in the folder "alps\Library\tutorials\dmrg-01-dmrg" for a ladder structure. However, I do not know how and where should I exploit "printgraph parameter_file" as it mentioned by developers to show the structure which a user is making use. Really, I wish to add the diagonal links on the structure and consequently I want to see the changed shape. But I do not understand how use printgraph!!! Thankx so much