pan class="op">/</span> <span class="op">(</span><span class="va">model_time</span> <span class="op">+</span> <span class="va">a</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">mat1</span> <span class="op">&lt;-</span> <span class="fu"><a href="define_transition.html">define_transition</a></span><span class="op">(</span></span></span>
<span class="r-in"><span>  <sp