an class="dt">id =</span> <span class="dv">1</span><span class="op">:</span><span class="dv">4</span>,</a>
<a class="sourceLine" id="cb3-7" data-line-number="7">                <span class="dt">chromosome =</span> <span class="kw"><a href="https://www.rdocumentation.org/packages/base/topics/c">c</a></span>(<span class="st">"chr1"</span>, <span class="st">"chr2"</span>, <span class="st">"chr1"</span>, <span class="st">"chr1"</span>),</a>
<a class="sourceLine" id="cb3-8" data-line-number="8">                <