ALPS users and developers,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I am wondering in ALPS how to construct the measurement of String Order Parameter in paper: 2012 New J. Phys. 14 065012.<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I have tried to measure the operators independently but the result was wrong. <br><br><br><br><br>Xiao Liang<br>