If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?

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Is there a difference in skin tone among North Indians, South Indians, and East Indians? If so, which group is considered to have a fairer complexion? - Quora

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If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?