Deprojected surface density profiles of different disks in NGC 551. The solid blue line represents the stellar surface density, whereas the dashed orange and dashed-dotted green lines represent the molecular and atomic gas surface density profiles, respectively. The stellar surface density profile was obtained using the Spitzer 3.6 μm map and MGE fitting. The Σ_H2 is measured from maps from Bolatto et al. (2017). The Σ_HI profile is obtained through a 3D tilted ring model fitting of the H I spectral cube obtained through the uGMRT (Swarup et al. 1991; Gupta et al. 2017) observation. See the text for more details.