Left: SDSS true-color image of LTG NGC 0036. The white circle overlaid in the SDSS image depicts the bulge diameter (with radius R_B) and the innermost black circle illustrates the bulge radius that was considered for this study (with radius R_C, defined in Sect. 3.2). The radius of the outermost black circle corresponds to the limit of the disk (with radius R_D). Right: SDSS g-band SBP illustrating the assumed three disk configurations (black points – observed profile; blue solid line – standard exponential disk, expD; green solid line – inwardly flattening disk, flatD; red solid line – centrally depressed disk, decrD). The colored dashed lines represent the modeled bulge after subtraction of the respective disk’s profile. The horizontal line denotes the limiting surface brightness at μ = 24 mag/▫″. Gray vertical lines denote the considered limits for the disk (the outermost gray line is illustrated by the uttermost circle in the l.h.s.), dashed vertical black line depicts R_B (innermost black circle at the l.h.s.) and the dashed-dot vertical black line the R_C (white circle at the l.h.s.). The galactocentric distance (x axis) is normalized to R_eff.