NED object is MESSIER 082; Reference is 1977MNRAS.178..577C

   Figure 4. The high-resolution (2 arcmin) isovelocity map plotted inside the
 120K km per second H I contour surrounding M82. The dashed lines A+A-, B+B-,
 C+C- indicate the directions of 'cuts' through the field shown in Fig. 5. The
 dotted line is the full beam-area marked as in Fig. 2.