Fig. 4
From: Indoor air pollutants and their seasonal monitoring in European museums
Distribution of AcOH concentrations by location type and season (red X—average value), the width of the violin plot shows the distribution of datapoints in the concentration ranges. The high concentration locations GGH DC and FST SE can be identified as the outliers in the distributions. [Location FST SR (cabinet) was omitted from the SR graph due to the distinct difference in the character between this location and the other SR locations.] Plots for the other pollutants are available in Additional file 2: S2