Ratio of 28.4 GHz residual to the 100 μm flux density as a function of the AME significance. The symbols are as in Fig. 6. The Perseus (P) and ρ Ophiuchi (R) clouds are indicated. The weighted and unweighted average ratios for the significant AME regions are shown as the solid horizontal lines. The average ratio from Todorović et al. (2010, dashed line) and Davies et al. (2006, dot-dashed line) are also shown.