first parameter along the negative real axis.
<p><b>Returns</b>
<p><a name="7.3.8.2p3" href="#7.3.8.2p3"><small>3</small></a>
first parameter along the negative real axis.
<p><b>Returns</b>
<p><a name="7.3.8.2p3" href="#7.3.8.2p3"><small>3</small></a>