    The standard deviation of the Gaussian to convolve with the shadow's shape. 
                  <div class="features">final</div>
</dd>
        <dt id="blurSigma" class="property">
          <span class="name"><a href="../dart-ui/Shadow/blurSigma.html">blurSigma</a></span>
          <span class="signature">&#8594; <a href="../dart-core/double-class.html">double</a></span>         
        </dt>
        <dd>
          The <a href="../dart-ui/Shadow/blurRadius.html">blurRadius</a> in sigmas instead of logi