k_distribution_1cmp</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-4" title="4"><span class="st">  </span><span class="kw">pk_distribution_2cmp</span>() <span class="op">+</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">"centr