The comparison maps between SiO(3–2) and HNCO(5–4) in overlay and ratio maps. In the overlay (a) map the HNCO(5–4) is shown in color map, and SiO(3–2) in contours. The contour starts from 3.0σ, with step of 3.0σ. In (b) the SiO(3–2)/HNCO(5–4) ratio map is displayed. The black and red square boxes mark the regions listed in Table 2, where the AGN is marked in red. The contour starts from 3.0σ, with step of 3.0σ. These maps were pre-smoothed to the common resolution of and masked by 3.0σ threshold.