n: (Gr or AxGr) object to be checked.</span>

<span class="sd">    Returns:</span>
<span class="sd">      The equivalent object  when crd is equivalent to one of the Coord objects in argument, None otherwise.</span>

<span class="sd">    See also:</span>
<span class="sd">      eq_in method of Ax, GrAx</span>
<span class="sd">      is_equiv</span>
<span class="sd">      make_equiv</span>
<span class="sd">      eq_index</span>
<span class="sd">      eq_in   </span>
<span class="sd">    &quot;&quot;&quot;</spa