Predictor importance vertical axis unit

Hello :) I am reading the fitctree document on (https://www.mathworks.com/help/stats/fitctree.html) and wondering what is unit on the vertical axis? The range is 6*10^-5. Is it a non-dimensional value and just shows a comparison? If so, any explanation would be appreciated.
Thank you

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R2018a

Asked:

on 10 Oct 2018

Edited:

on 10 Oct 2018

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