Background-subtracted radial distributions of GCs associated with NGC 3640 (left panel) and NGC 3641 (right panel), fitted with a R^1/4 de Vaucouleurs profile. On the y-axis, the logarithm of the background-subtracted density profile is plotted against the fourth root of the galactocentric distance from each galaxy photocenter. The green shaded lines represent the surface brightness profile of the galaxy in the g-band with an arbitrary shift. The yellow shaded areas delineate a region in the density profiles likely associated with intra-group GCs. Light-blue and red vertical solid lines mark the distances where NGC 3630 and NGC 3643 are located, respectively.