Hello Dear ALPs users I have 2 questions.I am novice in ALPS. 1- I want to calculate correlation function for coupled ladders. my input file is attached in the output file, there are 4 values of correlation function for nearest neighbors. this is part of output file *Spin Correlations*[( 0,0 ) -- ( 0,1 )]*Spin Correlations*[( 0,0 ) -- ( 0,1 )]*Spin Correlations*[( 0,0 ) -- ( 0,1 )]*Spin Correlations*[( 0,0 ) -- ( 0,1 )] -whereas i expect there is one of them or at least 3 of them (x-y-z), is there a bug in the input file or something else? 2- How do I define an alternating chain? (my mean is alternating coupling constants) Best Regards