Histogram of the morphological type of the host galaxy and the classification of the nuclear Hα emission. It is divided into ellipticals (E), spirals (S), and lenticulars (S0); CH stands for Core-halo, Di for Disky, Du for Dusty, and B for Bubble. The purple lines are for the sample from this work, blue for M11, and yellow for the combination of both samples. Unclear cases or irregular galaxies are not included in the figure, and thus the percentages do not sum up 100%.