Ratio of 2MASS K-band to 5 μm monochromatic continuum emission as a function of 3.3 μm PAH EQW. The EQWs are derived from the AKARI spectra extracted with an aperture covering ∼95% of the total AKARI flux. The K-band emission is measured in the imaging data using the same aperture size. The symbols are the same as in Fig. 2, in addition to the red diamonds, which indicate PAH_{3.3 μm} EQW < 0.04 μm and PAH_{6.2 μm} EQW < 0.4 μm.