NED object is MESSIER 033; Reference is 1987A&AS...68..171B

   FTGURE 8.-Distribution of the total intensity at 6.3 cm in the field of M33
 shown as contours starting at 1.5 mJy per b.a. (2 {sigma}). Positions of 17
 point sources are marked. The coordinate grid is the same in all maps and
 refers to right ascension and declination of 1950.0. The optical centre at
 {alpha}_50_ = 1h31m01.67s and {delta}_50_ = 30deg24'15.0" (de Vaucouleurs and
 Leach, 1981) is marked by << + >> in all figures.