Hi, Does anybody know if the CLUST_WTS and CLUSTER functions can be used in IDL 5.4? I looked in the help, and the syntax is outlined, but the .pro files aren't in the library. I noticed that these routines are heralded as "new" in IDL 5.5. Has the help been updated before the program itself!? Any ideas gratefully received as to how I can run these routines without upgrading! :) Thanks, Martin