n class="st"> </span><span class="dv">180</span>/pi, R, <span class="dt">colour =</span> thickness, <span class="dt">group =</span> thickness)) +<span class="st"> </span>
<span class="st">    </span><span class="kw">scale_y_continuous</span>(<span class="st">"Reflectivity"</span>, <span class="dt">expand =</span> <span class="kw">c</span>(<span class="dv">0</span>, <span class="dv">0</span>), <span class="dt">limits =</span> <span class="kw">c</span>(<span class="dv">0</span>, <span class="dv">1</span>)) +<