Dear All,<div>&nbsp;For the lattice in alps, we can use&nbsp;<span style="line-height: 1.2;">&lt;LATTICES&gt;&nbsp;</span><span style="line-height: 1.2;">&lt;GRAPH&gt;, in which can define an arbitrary lattice. However I find when I use this way, the stiffness measured in QMC is always zero. I wonder how to fix it. Thank you very much.</span></div><div><br></div><div>Sincerely,</div><div>Huaiming Guo</div><div><br></div><div><br></div>