title: Gnuplot-Set colorbar Maxima and Minima
body: <p>I am plotting heatmap of this <a href="http://www.filedropper.com/2mp2f36" rel="noreferrer">data</a> using the following code</p>
  
  <pre><code>reset 
  set terminal pngcairo size 800,800
  set output 'Temp.png'
  #set terminal tikz
  #set output 'Temp.tex'
  set lmargin at screen 0.05
  set rmargin at screen 0.85
  set bmargin at screen 0.1
  set tmargin at screen 0.9
  set palette defined ( 0 '#000090',\
                        1 '#000fff',\
                        2 '#0090ff',\
                        3 '#0fffee',\
                        4 '#90ff70',\
                        5 '#ffee00',\
                        6 '#ff7000',\
                        7 '#ee0000',\
                        8 '#7f0000')
  set pm3d map interpolate 20,20
  unset key
  set multiplot
  
  # plot the heatmap
  splot '2m_p2_f36.txt' using 1:2:3
  
  unset multiplot
  unset output
  </code></pre>
  
  <p>And I get a result like this<a href="https://i.stack.imgur.com/rfMJC.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rfMJC.png" alt="heatmap"></a>
  I would like to set the colormap maxima and minima manually. This is because I have to plot other plots where temperature can go upto 1000 C. So I don't want red colour indicating 300 C in one plot and 1000 C in another plot. How do I do this Gnuplot?</p>