How to best track performance changes due to altitude?

Hi there,
Do you guys have any custom scripts to help you analyze the data regarding watts, HR at different altitudes? Appreciate any info. Thanks!

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One idea could be to create PWR:HR curves (Just like the Seasons Compare Chart PWR:HR), but instead of seasons, or time frames, one could use buckets of altitude. For instance, in my example:

Sea Level 0 - 2000ft
Low Altitude 2000 - 5000 ft
Feels Easy 5000 - 6000 ft
Downvalley 6000 - 7000ft
Home 7000 - 8000 ft
Normal Climbs 8000 - 9000 ft
High Altitude Climbs 9000 - 10000 ft
Tree line Climbing > 10000ft

Does anybody know how to code this in java script?