pan><span class="op">(</span><span class="st">"emax"</span><span class="op">)</span> <span class="op">+</span></span></span>
<span class="r-in"><span>  <span class="fu"><a href="prm_no_var.html">prm_no_var</a></span><span class="op">(</span><span class="st">"ed50"</span><span class="op">)</span> <span class="op">+</span></span></span>
<span class="r-in"><span>  <span class="fu"><a href="obs_proportional.html">obs_proportional</a></span><span class="op">(</span><span class="va">effect</span><span class="op">