+</span></a>
<a class="sourceLine" id="cb1-5" title="5"><span class="st">  </span><span class="kw">pk_elimination_linear</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-6" title="6"><span class="st">  </span><span class="kw">obs_additive</span>(conc<span class="op">~</span>C[<span class="st">"central"</span>]) </a>
<a class="sourceLine" id="cb1-7" title="7">pkm</a></code></pre><p></p></div>
</div>

<div class="section">
<h3 id="parameter-models">Parameter models<a class="anchor" aria-la