} t_1 \leq t \leq
t_2 \\
k &amp; \text{if } t_2 \leq t \leq (t_2 + dt) \\
k + \beta \cdot (t - (t_2 + dt)) &amp; \text{if } t &gt; (t_2 + dt)
\end{cases}
\end{equation}\]</span></p>
<p>To enforce <span class="math inline">\(dt &gt; 0\)</span> and <span class="math inline">\(\beta &lt; 0\)</span> (i.e., a non-positive slope
at the end of the curve), we specify bounds in the modeler function as
follows:</p>
<div class="sourceCode" id="cb6"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><s