class="va">phi</span><span class="op">)</span><span class="op">)</span>, size <span class="op">=</span> <span class="fl">0.8</span><span class="op">)</span> <span class="op">+</span> 
  <span class="fu">geom_hline</span><span class="op">(</span>yintercept <span class="op">=</span> <span class="fl">0</span>, linetype <span class="op">=</span> <span class="fl">2</span>, color <span class="op">=</span> <span class="st">"#C0C0C0"</span><span class="op">)</span> <span class="op">+</span>
  <span class="fu">geom_