class="op">=</span> <span class="cn">TRUE</span>,</span>
<span>  alpha.f <span class="op">=</span> <span class="fl">1</span>,</span>
<span>  red.f <span class="op">=</span> <span class="fl">1.7</span>,</span>
<span>  green.f <span class="op">=</span> <span class="fl">1.5</span>,</span>
<span>  blue.f <span class="op">=</span> <span class="fl">6</span>,</span>
<span>  offset <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(