A. Huck 13 years ago I am looking at the code of http://www.reproducibility.org/RSF/book/jsg/simistack/simple.html and got the error that two programs are not found: snrstack and smstack. Where are they? Also I do not understand if SOURCE[i] is an input or an output and how it is used. I do not know if this is the right channel for such a discussion. Email will be OK too. Thanks a lot for your help.