Hi, Do you know what the following mean in a heap profile? _apply3 is the one I'm particularly interested in. Prelude._apply3 Prelude._apply1 Amanda -- Amanda Clare http://users.aber.ac.uk/ajc99/ Tel: +44 (0)1970 621922 Fax: +44 (0)1970 622455 Dept. of Computer Science, University of Wales, Aberystwyth, SY23 3DB