title: Gradient colors on axis in R
body: <p>I'm currently trying to reproduce some of our graphs in R.
  At the moment we use Excel to produce our graphs and 1 of the options in Excel is the use of gradient colors on the axis. I have added some pictures as an example. 
  My question is if a similar option is available in R (in ggplot). I can't find any useful information about this issue on the web. Thanks in advance for any response!</p>
  
  <p>Greetings, Erik</p>
  
  <p>!<a href="https://ibb.co/drRd8x" rel="nofollow noreferrer">https://ibb.co/drRd8x</a>
  !<a href="https://ibb.co/jvPbvc" rel="nofollow noreferrer">https://ibb.co/jvPbvc</a></p>