="op">$</span><span class="va">slc</span>, freq <span class="op">=</span> <span class="cn">FALSE</span>, xlab <span class="op">=</span> <span class="st">"sodium lithium countertransport"</span>,</span></span>
<span class="r-in"><span>     main <span class="op">=</span> <span class="st">""</span>, col <span class="op">=</span> <span class="st">"lightblue"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/graphics/lines.html" class="external-lin