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We study the eigenproblem for Bethe subalgebras of the Yangian$Y(\mathfrak{gl}_n)$ in tame representations, i.e. in finite dimensionalrepresentations which admit Gelfand-Tsetlin bases. Namely, we prove that forany tensor product of skew modules $V=\otimes_{i=1}^k V_{\lambda_i \setminus\mu_i}(z_i)$ over the Yangian $Y(\mathfrak{gl}_n)$ with generic $z_i$'s, thefamily of Bethe subalgebras $B(X)$ with $X$ being a regular element of themaximal torus of $GL_n$ (or, more generally, with $X \in \overline{M_{0,n+2}}$)acts with a cyclic vector on $V$. Moreover, for $X$ in the real form of$\overline{M_{0,n+2}}$ which is the closure of regular unitary diagonalmatrices we show, that the family of subalgebras $B(X)$ acts with simplespectrum on $\otimes_{i=1}^k V_{\lambda_i \setminus \mu_i}(z_i)$ for generic$z_i$'s where all $V_{\lambda_i \setminus \mu_i}(z_i)$ are Kirillov-Reshetikhinmodules. In the subsequent paper we will use this to define a KR-crystalstructure on the spectrum of a Bethe subalgebra on $V$.

Spectra of Bethe subalgebras of $Y(\mathfrak{gl}_n)$ in tame representations