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Puzzle 3

Been stuck on this for a few days now, sure it’s something obvious that I’m missing, have tried several answers, but no luck. Any hints to help me along the way?

The whole graph describes Key 2.

The arrow is a significant change.

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kisanna12 and andyleefisher have reacted to this post.
kisanna12andyleefisher

The arrow is described by

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Bambookoala has reacted to this post.
Bambookoala

Key 2 also helps... and google as always 🙂
the solution is: 

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