Star formation rate surface density (Σ_SFR) with the shaded area representing the 1σ uncertainty of NGC 3995 (top left panel) and NGC 3994 (bottom left panel). 2D maps of the excess in the J0660 filter (right panels), representing the Hα emission areas are shown. One, two, and three R/R_eff ellipses are overplotted. The Σ_SFR values are compared in each case with a control sample of spirals matched in stellar mass and morphology (dashed black lines). Gray shaded areas show the dispersion of the Σ_SFR in the spiral samples. The solid black line (bottom left panel) shows the CALIFA Σ_SFR measurements of the galaxy. Both the spiral samples and the individual galaxy measurements were performed by González Delgado et al. (2016).