I have a model in Excel 2003. Originally 150 data lines (size 4MB).
Expanded it to 1150 data lines (size 23 MB about what I expected). I then
tried to expand to 2150 data lines and the file ballooned to 112MB.

I have checked and there are no super large named ranges or unused cells
after my last real used cell in each sheet.

Any ideas what could be causing the sudden jump in size?

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Thanks

Steve