title: Gnuplot says file is unreadable
body: <p>I have a file called &quot;data_prova.dat&quot; in my folder, as you can see:</p>
  <blockquote>
  <p>gnuplot&gt; !ls</p>
  <p>data_prova.dat</p>
  </blockquote>
  <p>But when I ask gnuplot to plot it, it says:</p>
  <blockquote>
  <p>warning: Skipping unreadable file &quot;./data_prova.dat&quot;</p>
  <p>No data in plot</p>
  </blockquote>
  <p>which is just false, because:</p>
  <blockquote>
  <p>wc -c data_prova.dat</p>
  <p>2640413132 data_prova.dat</p>
  </blockquote>
  <p>Can this be because the file is too large?</p>