title: MATLAB scatter density plot with color restriction
body: <p>Im very new to matlab and I know its quite simple but I dont know what to search for..</p>
  
  <p>I made a x,y scatter plot with efficiency(0~1)</p>
  
  <pre><code> scatter(sun(:,1),sun(:,2),19, sun(:,3),'fill')
  </code></pre>
  
  <p>My question is how to limit the color variation, for example from bright yellow to dark red instead of from dark blue to dark red, which are the default colors.</p>
  
  <p>Another question I have is, is it possible to surround each data point with a black line to make it more clear to the viewer?</p>
  
  <p>Thanks!</p>