[ALPS-users] the right way to define a harmonic trap

Hi,all I am confused about how to define a harmonic trap in ALPS, shall I add it directly to the SITETERM as follows? <SITETERM type="0" site="i"> <PARAMETER name="x" value="i"/> -mu*n(i)+V*n(i)*(x-L/2)*(x-L/2) </SITETERM> where parameters mu and V, operator n(i) are defined in my_models.xml but, L the length of lattice is defined in a separate independent file my_lattices.xml. Is this kind of definition of harmonic trap OK in ALPS? Bo-Nan -- Stay foolish,Stay hungry.