Profile of the 100 and 250 μm residuals as a function of the projected distance from M 87 for the V2 field (black solid line). The gray lines and error bars are the average and standard deviation of the profiles from the center of each of the other three HeViCS tiles. The red solid line is the profile at 100 μm predicted from the 250 μm data and assuming the average 100/250 color ratio (see text for details). Each profile was obtained by azimuthally averaging the residuals over circular coronas of width 6′.