Fig. 4. (a) Surface plots with effects of number of perforations (P), weight of CO2 scavenger (S) and amount of mushrooms (W) on (1) weight loss, (2) pH and (3) firmness of
mushrooms, after 3 days at 10 C. (b) Pareto charts of standardised effects for number of perforations, weight of CO2 scavenger and amount of mushrooms on (1) weight loss,
(2) pH and (3) firmness of mushrooms, at 95% significance level, indicated as a vertical dashed line.