s="sd">            |   None defaults to the one set in :fwtft: </span>
<span class="sd">            |   or else to the default of cspace.</span>
<span class="sd">        :xyzwr:</span>
<span class="sd">            | None or ndarray, optional</span>
<span class="sd">            |   Whitepoint tristimulus values of reference data</span>
<span class="sd">            |    None defaults to the one set in non-empty :fwtfr: </span>
<span class="sd">            |    or else to default of cspace.</span>
<span class=