title: What does `total` mean in the field `mode` of `closeness` definition in `igraph` package?
body: <p>What does <code>total</code> mean in the field <code>mode</code> of <code>closeness</code> definition in <code>igraph</code> package?</p>
  <pre><code>closeness(
    graph,
    vids = V(graph),
    mode = c(&quot;out&quot;, &quot;in&quot;, &quot;all&quot;, &quot;total&quot;),
    weights = NULL,
    normalized = FALSE
  )
  </code></pre>