title: How choose which column put on axis like label?
body: <p>I have a csv file like this:</p>
  
  <pre><code>10557,1925080,1236052,1210752,1182492
  11254,3159084,2264460,2187584,2144416
  11334,2348036,1540692,1504536,1458332
  11456,1607704,993228,974676,960308 
  .....
  </code></pre>
  
  <p>I want create a chart with these data. I want use the first column as x-axes label, and put all other column like different line inside the chart. how can I do it? </p>
  
  <p>This is my code</p>
  
  <pre><code> set terminal pngcairo enhanced font "arial,10" fontscale 2.0 size 1680, 1024
   set size 1,1 
   set ylabel '[y]'
   set xlabel '[FIRST COLUMN FROM CSV]'
   set datafile separator ","
   set autoscale fix
   set key top left
   set key box
   set output 'Figure1.png'
  plot  \
  "figure1.csv" using 2 w l linewidth 3 lc rgb "black" title "second colum", \
  "figure1.csv" using 3 w l linewidth 3 lc rgb "black" title "third colum", \
  "figure1.csv" using 4 w l linewidth 3 dashtype 2 title "fourth colum", \
  "figure1.csv" using 5 w l linewidth 3 dashtype 5 title "fifth colum"
  </code></pre>