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Dear Robert, we have calculate the regression formulas for some bones of pike (Esox lucius). You can see: De Grossi Mazzorin Jacopo & Frezza Anna Maria, 2000: Lo sfruttamento delle risorse fluviali di due insediamenti veneti dell’ Età del Bronzo: Canàr (VR) e Frattesina (RO), in Atti del 2° Convegno degli Archeozoologi Italiani, Asti 14-16 novembre 1997, Forlì, pp. 241-250. These are the results: Size Parasphenoid (meas. 3 in Morales & Rosenlund 1979) y = 12,616 x + 7,0366 (R2 = 0,941) Neurocranium (meas. 4 in Morales & Rosenlund 1979) y = 5,4918 x + 4,8494 (R2 = 0,961) Palatinum (meas. 2 in Morales & Rosenlund 1979) y = 3,8642 x + 7,2613 (R2 = 0,942) Quadratum (meas. 3 in Morales & Rosenlund 1979) y = 7,1668 x + 8,955 (R2 = 0,924) Cleithrum (meas. 3 in Morales & Rosenlund 1979) y = 4,8796 x + 8,6633 (R2 = 0,941) Dentale (meas. 4 in Morales & Rosenlund 1979) y = 6,9129 x + 11,795 (R2 = 0,936) Articulare (meas. 3 in Morales & Rosenlund 1979) y = 9,6648 x + 6,6862 (R2 = 0,885) The measurements are taken following “Morales A. and Rosenlund K., 1979, Fish bone measurements. An Attempt to Standardize the Measuring of Fish Bones from Archaeological Sites, Steenstrupia, Copenhagen”. Sincerely Jacopo De Grossi Mazzorin