Photometric properties of the BGG of RX J105453.3+552102. Top panels: r-band image of the BGG (left), 2D Sèrsic fitted model (center), and residuals of the fit (right). Middle panels: isophotal r-band dimming corrected surface brightness and unconvolved Sèrsic fitted model (left), ellipticity (center) and position angle (right) radial profiles of the BGG. Bottom panels: isophotal a₄ parameter (left), X coordinate (center), and Y coordinate (right) of the center of isophotes as a function of the galactrocentric distance.