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courbe de Hurter et Driffield
anal.chem.	emulsion characteristic curve; H and D-curve
nat.sc.	characteristic curve; d/log e curve; density curve; gradation curve; Hurter and Driffield curve; sensitometric curve; H and D curve
радиогр.	Hurter-Driffield curve; H-D curve; H. and D. curve; D log E curve (e.g. of an X-ray film)