Extended Data Fig. 8: Distributions of metric variables on flakes.
From: Late Middle Pleistocene Levallois stone-tool technology in southwest China
a, Histogram of flake lengths, coloured by size class. b, Box-and-whisker plots of a selection of metric variables to show technological variation across the size classes to reveal the lithic reduction sequence (n = 1,177 flakes). Centre lines show data median, boxes show first and third quartiles (the 25th and 75th percentiles), and the whiskers extend from the upper and lower hinge to the largest and smallest values that are no further than 1.5 times the interquartile range from the hinge (which is the distance between the first and third quartiles). Data beyond the end of the whiskers are outlying points and are plotted individually. Linear dimensions are measured in mm, mass in g.
