 is less sensitive at alpha and beta
frequencies and more sensitive at delta (blinks) and gamma (muscle)
frequencies.</dd>
<dt><strong><code>axis</code></strong> :&ensp;<code>int</code></dt>
<dd>Axis to filter on (default=-1, corresponding to samples).</dd>
</dl>
<h2 id="returns">Returns</h2>
<dl>
<dt><strong><code>out</code></strong> :&ensp;<code>array</code></dt>
<dd>Filtered data.</dd>
<dt><strong><code>zf</code></strong> :&ensp;<code>array, shape=(n_channels, filter_order)</code></dt>
<dd>Output filter 