title: Gnuplot 5.2 splot: Multiple pm3d palette in one plot call
body: <p>I wonder, can I used two different pm3d palettes in splot? I use Gnuplot 5.2 and 
  want to show two 3D surfaces, like ocean and land with different color palettes. Can I define this in some way like: </p>
  
  <pre><code>splot "file" u 1:2:3 with pm3d palette 1, "file" 1:2:4 with pm3d palette 2
  </code></pre>
  
  <p>The data in column 1 and 2 are integers that extend from 0 to 100, they define a grid. The boundaries may be different for different maps.  The z axis  values are real numbers representing relative changes on logarithmic scale and extend from -10 to 10. </p>
  
  <p><a href="https://i.stack.imgur.com/22wHI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/22wHI.png" alt="enter image description here"></a></p>