NED object is MESSIER 081; Reference is 1977MNRAS.178..577C

   Figure 3. The low-resolution (4 arcmin) isovelocity map plotted inside the
 faint 59 K km per second H I contour surrounding the galaxies. The dashed
 ellipses and crosses are as in Fig. 1 and the rms noise is 6 km per second.
 Velocities are with respect to the Sun.