 method whenever possible.</span>

<span class="sd">        Args:</span>
<span class="sd">            d (np.array): The derivatives array.</span>
<span class="sd">            c (np.array): The descriptor array.</span>
<span class="sd">            system (:class:`ase.Atoms`): Atomic structure.</span>
<span class="sd">            centers (list): Centers where to calculate SOAP. Can be</span>
<span class="sd">                provided as cartesian positions or atomic indices. If no</span>
<span class="sd">     