Fig. 1From: Oxidative degradation of archaeological wood and the effect of alum, iron and calcium saltsOxygen consumption of iron-treated model birch samples and references, as described in Table 1, shown as: a concentration of oxygen as a % saturation in the atmosphere of the airtight bags (values shown for one sample of each set of three samples); b initial oxygen consumption rates as μg O2 (g wood)−1 day−1 for all three samples in each set, calculated from data between 100 and 80% saturation (with means and standard deviations for each set given below)Back to article page