 beamwidth apart. [Default = fill the total extent of the cube]</p>
</dd>
<dt>vel_guess<span class="classifier">float</span></dt><dd><p>Optional - starting guess for the tilted ring asymptotic velocity. km/s [Default = 28percent of the velocity width coverved by the cube]</p>
</dd>
<dt>xcent_range<span class="classifier">two element ndarray</span></dt><dd><p>Allowed range for fitting of the kinematic centre. RA in degrees [Default: minimum and maximum RA within the input cube]</p>
</dd>
<dt>ycent_range<span