How do I use pchip only over a selected range?

I am creating a plot from a spreadsheet of data. I would like to interpolate values only over a specific range of this data. I will end up using all of the data in the spreadsheet but I would only like interpolate some of it. How do I go about doing this? Any example code would be very helpful, thanks.

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Do you know the criteria by which you will select these lucky few data points?

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