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We estimate sensitivity coefficients Q_\mu to variation of theelectron-to-proton mass ratio \mu for microwave transitions in partlydeuterated ammonia NH2D and ND2H. Because of the mixing between rotational andinversion degrees of freedom the coefficients Q_\mu strongly depend on thequantum numbers of the transition. This can be used for astrophysical searchfor possible variation of the constant \mu.

Sensitivity of microwave spectra of deuterated ammonia to variation of electron-to-proton mass ratio