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The elastic constants C 11 , C 33 , C*=(C 11 +C 12 +2C E66 )/2, C E44 , C D44 and C E66 have been investigated from room temperature up to 195 o C. Small but unambiguous features are observed for most constants in the vicinity of 125+/-5 o C. They confirm the existence of a transition which has been suggested by several previous studies by other techniques.