NASA/IPAC EXTRAGALACTIC DATABASE
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   NED object is NGC 2820; Reference is 1979MNRAS.187..525R

   Plate 1. Hydrogen integrated over the velocity range 1451 to 1767 km per
 second, and superimposed on a blue photograph from the Palomar Sky Survey
 (copyright by the National Geographic Society - Palomar Sky Survey). The
 dashed contour is 200 K km per second. Solid contours start at 300 K km per
 second and are at intervals of 100 K km per second. Small crosses are star
 positions for alignment. The large cross is the map centre. The labels refer
 to the remaining (medium sized) crosses which are at the optical centres of
 those galaxies. The hatched ellipse represents the HPFW resolution of 2.5 x
 2.8 arcmin. No polar diagram correction has been applied, but this correction
 increases values at the nucleus of NGC 2805 by only 1 per cent, and values at
 the nucleus of NGC 2820 by 3 per cent.

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