Fig. 7From: The many faces of Reigate Stone: an assessment of variability in historic masonry based on Medieval London’s principal freestoneBox and whisker plots, showing a higher and more uniform bulk density in building stone, b slightly higher open porosity in building stone, and c more uniform response to pulse velocity measurement in building stone. Central line of box depicts mean value; lower and upper edges of box correspond to 25th and 75th percentile (IQR); whiskers extend to the largest/smallest value within 1.5 * IQRBack to article page