title: How to format line size in ggplot with multiple lines of different lengths?
body: <p>I am able to make the plot correctly, but I would like to increase the line sizes to make the plot more readable. When I try size inside the geom_line, my lines get super fat.
  I have three time series variables (x,y, z) in the dataframe &quot;data&quot;, which I want to plot on the y-axis, and they are of different length, meaning the plots start at different time.
  How can I change the size of the lines without making them huge?</p>
  <pre><code>P_comp &lt;- ggplot(data, aes(x=Date))+
    geom_line(aes(y = x, colour = &quot;green&quot;))+
    geom_line(aes(y = y, colour = &quot;darkred&quot;))+
    geom_line(aes(y = z, colour = &quot;steelblue&quot;))+
    theme_ipsum()+
    theme(panel.grid.major = element_blank(), panel.grid.minor = element_blank())+
    theme(text = element_text(family = &quot;serif&quot;))+
    xlab(&quot;Time&quot;) + ylab(&quot;Value&quot;) +
    ggtitle(&quot;EPU Indices&quot;)+
    theme(plot.title = element_text(hjust = 0.5, family = &quot;serif&quot;, face = &quot;plain&quot;, size = 16))+
    theme(axis.title.x = element_text(hjust = 0.5, family = &quot;serif&quot;, size = 12, face = &quot;plain&quot;))+
    theme(axis.title.y = element_text(hjust = 0.5, family = &quot;serif&quot;, size = 12, face = &quot;plain&quot;))
  P_comp
  </code></pre>
  <p><img src="https://i.stack.imgur.com/10Z2K.png" alt="This is the plot without using size argument" /></p>
  <p><img src="https://i.stack.imgur.com/3Vopo.png" alt="This is the plot when inputting size= 1 in one of the geom_lines" /></p>