title: Logarithmic scale in x axis but only up to a certain value, in python
body: <p>I'd like to do a graph like the one below
  <a href="https://i.stack.imgur.com/uj7EM.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uj7EM.jpg" alt="enter image description here"></a></p>
  
  <p>The figure can be found in <a href="https://arxiv.org/abs/1807.06209" rel="nofollow noreferrer">this paper</a></p>
  
  <p>Here the x-axis scale is logaritmic up to <code>l=30</code> and linear for <code>l&gt;30</code>. How can I achieve something like that in python using matplotlib?</p>