 class="op">$</span><span class="va">correction_means</span><span class="op">[</span>, <span class="st">"meand13CPl"</span><span class="op">]</span>,</span>
<span>  y <span class="op">=</span> <span class="va">geese_data_day1</span><span class="op">$</span><span class="va">source_means</span><span class="op">[</span>, <span class="st">"meand15NPl"</span><span class="op">]</span> <span class="op">+</span> <span class="va">geese_data_day1</span><span class="op">$</span><span class="va">correction_means</span>