Fig. 3From: Assessing clarity and erasability of commercially available pens for surgical site marking: a comparative study in human volunteersScatter chart displaying the raw grayscale data for marks made on the upper limb. The y-axis represents the level of grey with 0 being black. Along the x-axis are represented the different markers and a base level representing bare skin. Filled diamonds show figures prior to surgical preparation and unfilled show figures afterBack to article page