How do I extract the highest and lowest data from MATLAB figures?

Hello, I am willing to extract some data from MATLAB figures I made.
I am aiming for extracting the highest and lowest data on the figures.
I did found extracting data using The Children Property, yet i can't find any codes related to extracting the highest and lowest data in the graphs.
please help.
thank you for ur time.

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Asked:

on 11 Jul 2019

Answered:

on 11 Jul 2019

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