title: Plot multiple series with different range of values in a single chart
body: <p>I have the following data:</p>
  
  <pre><code>df_nse_1
  
    Number repo revrepo  nse
  1      1  5.0     4.0 4579
  2      2  5.5     4.5 4781
  3      3  5.8     4.8 4883
  4      4  6.0     5.0 4984
  5      5  6.0     5.0 5002
  6      6  6.0     5.0 5038
  7      7  6.2     5.2 5085
  8      8  6.5     5.5 5187
  9      9  7.0     6.0 5389
  </code></pre>
  
  <p>I am tried plotting the three series together as below:</p>
  
  <pre><code>library(ggplot2)
  p_nse &lt;- ggplot() + 
    geom_line(data = df_nse_1, aes(x=Number, y=repo, color = "Repo"),size=1.4) + geom_line(data = df_nse_1, aes(x=Number, y=revrepo, color = "Reverse Repo"),size=1.4) + geom_line(data = df_nse_1, aes(x=Number, y=nse, color = "nse"),size=1.4) + ylim(2,5400) + scale_x_continuous(breaks = c(2,4,6,8,10))+ labs(color="") + xlab('\nNumber') + ylab('LAF rates (%) &amp; Estimated nse prices\n') + ggtitle("Estimated nse closing Prices given changes in LAF &amp; CRR Rates") + theme(axis.text.x=element_text(size=12, color = "black")) + theme(plot.title = element_text(lineheight=.8, face="bold",colour = "black",hjust = 0.5,vjust = 2,size = 10))
  
  p_nse
  </code></pre>
  
  <p>I got the following chart:
  <a href="https://i.stack.imgur.com/zlClz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zlClz.png" alt="enter image description here"></a></p>
  
  <p>I am unable to get the repo &amp; revrepo var plotted clearly as the values of nse variable is relative bigger than these variables.Since i Have to show the co-movement of nse with repo &amp; revrepo var, Is there a way where the y axis can be squeezed so that all three series  can be seen clearly?</p>