title: How to draw a horizontal line at the large y-axis integer?
body: <p>For the following <code>data.dat</code> file:</p>
  
  <pre><code>08:01:59 451206975237005878
  08:04:07 451207335040839108
  08:05:56 451207643872368805
  08:07:49 451207961547842270
  08:09:56 451208317883903787
  08:10:12 451208364811411904
  08:14:09 451209030026853864
  08:16:19 451209395116787156
  08:17:14 451209552481002386
  08:20:22 451210080432357203
  08:25:36 451210963309583903
  08:30:23 451211772783766177
  08:34:04 451212394854723707
  08:35:53 451212702239472024
  08:48:46 451214876715294857
  08:49:56 451215072475511660
  08:51:24 451215321890488523
  08:52:39 451215533925588479
  08:52:42 451215542324801784
  08:54:30 451215845971562410
  08:55:08 451215951262906948
  08:58:30 451216519498960432
  </code></pre>
  
  <p>I'd like to draw a horizontal line at the specific level (e.g. <code>451211772783766177</code>). However, the number is too large to process.</p>
  
  <p>Here is my attempt (based on this <a href="https://stackoverflow.com/a/13498986/55075">post</a>):</p>
  
  <pre><code>$ gnuplot -p -e 'set arrow from 451211772783766177 to 451211772783766177; plot "data.dat" using 2 with lines'
  </code></pre>
  
  <p>which gives the following error:</p>
  
  <blockquote>
    <p>line 0: warning: integer overflow; changing to floating point</p>
  </blockquote>
  
  <p>How I should proceed?</p>