What is the meaning of this document T2.nii_Cohen_f2?

After completing the two-sample t-test by SA, two files were generated:T2& T2.nii_Cohen_f2.

What is the meaning of this document T2.nii_Cohen_f2?

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Cohen_f2 is the effect size map. See https://en.wikipedia.org/wiki/Effect_size Cohen's f square