[ALPS-users] Green's function measurement in the loop and directed loop codes

Hello, I was wondering what is the definition that that the loop and directed loop code return when the options: 'MEASURE[Correlations]' : True, 'MEASURE[Structure Factor]' : True, 'MEASURE[Green Function]' : True, Because I haven't been able to find them and I would like to know what they are and more importantly what prefactors it has or it hasn't. Thank you very much, Francisco Cordobes