How does the TR.IR.RatingRank compare to the Moodys Rating

Dear Community,

by using the TR.IR.RatingRank function in the Eikon API the output contains a certain number (e.g. 1, 2, 3, ...) representing a harmonized credit rating score of an issuer.

Can somebody tell me what each rank would translate to in Moodys Credit Rating Scale (Aaa, Aa1, ....).

Thank you in advance!

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