SB profile of the mean residual background at random points for the three background-subtracted field images used in this work. The error bars indicate the 1-σ scatter to the mean of the stacked background profiles. From the central region out to 100 kpc, the variation for p₀ and p₁ is similar, with p₂ having a radially increasing offset from the other two. Beyond 200 kpc, the zeroth-order background-subtracted images (p₀) have a steeper downturn than the other two. While p₁ has a similar trend as p₀, it is less steep. The downturn in p₂ is more gradual compared to the other two. However, for all three cases, the background reaches comparable values at ∼1 Mpc distance from the centre.