Identifying large Integrated File System files

I would like to find the very large files in IFS. I have done a disktasks and printed the summary report. It looks like the IFS is big. I did a RTVINFSTS and PRTDIRINF with the selection of '/' (root). I get huge spool files. There are 7,000 pages that are difficult to see. What else can I do to drill the problem?

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