True-colour image of the light echo of SN 1987A, in July 1989.
Three-colour image made from plates taken at the AAT prime focus. The image is the difference between two sets of three BGR plates:
2591—2311 IIa-O/GG 385 35/20m
2590—2312 IIa-D/GG 495 30/25m
2592—2310 098-04/RG 610 40/35m