Properties of the AMIGA isolated galaxies that are in the SDSS complete sample and have available NIR luminosities (n = 211). The main panel shows L_K versus the morphology. The SFN are marked as white round symbols, unclassified galaxies as black + symbols, TOs as cyan squares, and AGN as triangles (red triangles in general and yellow inverted triangles for the Seyfert 1). A small random scatter, like in Fig. 7, was added to the morphology values. The additional panels show the statistics for different types of nuclear activity with respect to the morphology (upper panel) and L_K (right panel). The box marks the lower and upper quartiles, the median is indicated as a red line inside the box, the whiskers extend to the most extreme datapoint within 1.5 × (x_75% − x_25%) from the median, and the outliers are marked as plus symbols. The mean values are marked using a star symbol. The mean of L_K for Seyfert 1 galaxies is indicated in the right panel with a cross at the left of the AGN box.