Residuals of Sérsic + exponential fit to SDSS r-band images of 55 star-forming blue ETGs from Meert et al. (2015). The S09 object identification number is given at the top of each image. The galaxy residual images showing the presence of recent interaction features are marked with D, indicating the presence of stellar debris. All images are of the same dimension, and a line of length 15″ is shown in the first image; this corresponds to the typical size of the galaxy. The location of the stellar debris feature is indicated with an arrow.