let's see, a 60 second catalog and 5 second window gives 12 windows which completely cover the catalog. How are you going to advance anything without running off the end?

Are we talking at cross purposes here?

On the program I sent you, if you choose a 1 day window for a 28 year catalog, it will take 20-30 seconds to run on my PC, maybe longer. And that's one pass on 10227 windows. You're suggesting hundreds of thousands of windows.

Lif's too short for that. The "accuracy" isn't worth it. And I doubt any increase in accuracy anyway.

Roger