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   NED object is MESSIER 081; Reference is 1988MNRAS.234..957A

   Plate 1. Column density map (corrected for primary beam attenuation)
 combined with earlier data of van der Hulst (1977) superimposed on a III-aJ
 48-inch Palomar plate. M81 lies near the plate centre. Contour values in this
 case are N_H_ 5 X 10**(19) (dotted), 1.5 X 10**(20), 5 X 10**(21) atom
 cm**(-2). The new field (extreme right on the plate) is to the south-west of
 M81. The regions to the north-west contain H I emission but lie outside the
 limits of the present observing field. The Palomar is copyright by the
 National Geographic Society-Palomar Observatory Sky Survey and is reproduced
 by permission of the Hale Observatories.

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