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At low temperatures they undergo a monoclinic distortion from orthorhombic $Pnma$-type structure with $a_p\\sqrt{2}\\times 2a_p\\times a_p\\sqrt{2}$ to a monoclinic structure with ($a_p\\sqrt{2}\\times 2a_p\\times a_p\\sqrt{2}$, $\\beta=90+\\epsilon\\sim 91.4^{\\rm o}$) and $P2_1/m$ space group below $T_N$. 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