"op">(</span><span class="va">xi</span>, <span class="va">ti</span><span class="op">)</span></span>
<span><span class="fu">transf.iirft</span><span class="op">(</span><span class="va">xi</span>, <span class="va">ti</span><span class="op">)</span></span>
<span><span class="fu">transf.ahw</span><span class="op">(</span><span class="va">xi</span><span class="op">)</span></span>
<span><span class="fu">transf.iahw</span><span class="op">(</span><span class="va">xi</span><span class="op">)</span></span>
<span><sp