title: How do I specify axis thickness in a plot? (in R)
body: <p>I am using using plot(), matplot() and ggplot(). I am guessing the answer will be the same for all of them.</p>
  
  <p>I want to specify the thickness of the y-axis, the x-axis, and the other two lines that constitute the box around the plot, all separately. How can I achieve that?</p>
  
  <p>Thanks in advance.</p>
  
  <p>Note: I have already read this - <a href="https://stackoverflow.com/questions/12485744/increasing-the-thickness-of-box-lines-in-an-r-boxplot">Increasing the thickness of box lines in an R boxplot?</a> , but I want to change the thickness of the individual axis lines separately.</p>