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I used IMERG because it's historical satellite measurements, not re-analysis using a model.

The focus was on creating extreme precipitation stats at a global scale, something that wasn't previously available. Many potential customers wouldn't even be aware of GloH20, ERA5, etc.

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Don't sell your potential customers too short. We've outsourced analysis to be done with ERA5 dataset to an external vendor. There are many who know what to do and can do it themselves, but would rather outsource for liability reasons.

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