span><span class="op">)</span>, heading<span class="op">=</span><span class="op">-</span><span class="fl">31.5</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/graphics/plot.default.html" class="external-link">plot</a></span><span class="op">(</span><span class="va">beam</span>, which<span class="op">=</span><span class="fl">5</span><span class="op">:</span><span class="fl">8</span><span class="op">)</span> <span class="co"># backscatter ampli