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Fig. 5. Box and whisker plots of (A) sound speed corrected to 37°C, (B) mass
density and (C) CT scan Hounsfield units for various tissue types in the
forehead and mandible. The lines of the boxes represent the lower-quartile,
median and upper-quartile values. The whiskers extending from each end of the
box show the extent of the remaining data. Outliers are represented by + signs
beyond the whiskers. The dark blue horizontal lines represent the sound speed
(1507 m s1), density (1026 kg m3) and HU
(0), respectively, of seawater at 15°C and 101 kPa.