Fig. 5From: Damage function for historic paper. Part I: Fitness for useRegression lines between FfU values (1–5) and levels of degradation (1–3) for tears (T, left column), missing pieces (MP, middle column) and discolouration (D, right column), for the six scenarios: H–D, P–D, R–D, H–R, P–R, R–R, from top to bottom Back to article page