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Large anomalies at \\tn\\ in the thermal expansion coefficient $\\alpha$ imply pronounced magneto-elastic coupling. Quantitative analysis yields the magnetic Gr\\\"uneisen parameter $\\gamma_{\\rm mag}=6.7(5)\\cdot 10^{-7}$~mol/J. The positive hydrostatic pressure dependence $dT_{\\rm N}/dp = 1.46(11)$~K/GPa is dominated by uniaxial effects along the $a$-axis. 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