Fig. 6From: Assessing clarity and erasability of commercially available pens for surgical site marking: a comparative study in human volunteers a and b Demonstrate the modelled data for each volunteer for upper limb and lower limb sites respectively. This encompasses data obtained for all pens viewed by all observers. c and d Demonstrate the modelled data for each observer for upper limb and lower limb sites respectively. This encompasses the data obtained for all pens across all volunteersBack to article page