a name="l00430"></a><span class="lineno">  430</span>&#160;    <span class="keywordtype">pure</span> <span class="keywordtype">elemental</span> <span class="keyword">function </span>lu_gre_velocity(mu_s, mu_c, stribeck, alpha, kz, &amp;</div>
<div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;            velocity, z) <span class="keyword">result</span>(dzdt)</div>
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