Fig. 6

Demography of the SurveNIR reference paper collection at different conditions of storage and access, and different fitness criteria. a 20 °C, 50 % RH, used 0.5 times a year, fitness threshold: 1 missing piece with text per 100 pages; b 20 °C, 50 % RH, used 0.5 times a year, fitness threshold: 50 missing pieces with text per 100 pages; c 20 °C, 50 % RH, used 0.1 times a year, fitness threshold: 50 missing pieces with text per 100 pages; d 10.5 °C, 50 % RH, used 0.5 times a year, fitness threshold: 1 missing piece with text per 100 pages. The vertical dashed line represents the long-term planning horizon of 500 years