Left panel: one of the 2003 AZ₈₄ images at 100 μm (green) with the original background. Right panel is the same map after the application of the double-differential background subtraction technique, as described in Kiss et al. (2014). 2003 AZ₈₄ is the source at the center of the images. In the right panel, the black source at the bottom left of 2003 AZ₈₄ is the negative image of 2003 AZ₈₄ resulting from the application of this background-removing technique. The FOV of each image is 2.5′× 2.5′.