True surface brightness contours and MGE fitting results in the observing plane x′-y′ for Au-23-85-50. The black contours in all panels represent the true surface brightness. The red contours in the top, middle and bottom panel denote the bar component with BP/X-shaped structure, the disk component and all components in the MGE fitting results, respectively. The contour interval is equal to 0.5 magnitude. The blue dashed line indicates the separating radius R₀ that distinguishes Gaussians as either part of the bar component or the disk component in the MGE fitting process (see Eq. (1)).