Source	Epoch	Contour PostScript	Colour PostScript	Colour GIF
1823+568 (4C +56.27, OU +539) BL Lac z= 0.664 V= 18.4 Notes (from the published papers):	08/1994 12/1995 05/1996 09/1997 10/1998 11/1998 05/1999 03/2001 08/2002	PS PS PS PS PS PS PS PS PS	PS PS PS PS PS PS PS PS PS	GIF GIF GIF GIF GIF GIF GIF GIF GIF

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