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

   FIGURE 7.-Distribution of the total intensity at 6.3 cm in the field of M33
 shown as contours starting at 3 mJy per b.a. (2 {sigma}). Positions of 21
 point sources exceeding 4 {sigma} are marked. The circle with the radius = 29'
 borders the area measured more deeply with the dual-beam system. 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.