NED object is MESSIER 033; Reference is 1986A&AS...64..237V

   FIGURE 2. Distribution of the radio continuum emission at 1.4 GHz in M33.
 This map has been cleaned and corrected for primary beam attennation. The
 contours are 0.3 (dashed), 0.6 and multiple of 0.6 mJy per beam area (1 mJy
 per beam area corresponds to 0.47 K brightness temperature). Background
 sources are indicated using the nomenclature of IK. Some well known bright HII
 regions are also indicated with their usual names. The angular resolution is
 24.8 x 46.8 arcsec.