title: How to modify ggplot2 stat_density_2d contour plot density scaling?
body: <p>I'm working with a two column table that I am trying to make a density contour plot out of. "HiChIP_VillusvsCrypt" is the x axis and "RNAseq_VillusvsCrypt" is the y axis. 
  <a href="https://i.stack.imgur.com/HQRZi.jpg" rel="nofollow noreferrer">If you see in this attached image, there is a legend with the density scaling from 0 to 0.2. I would like to be able to play around with this scaling, if possible (i.e. set bounds between 0 and 0.1).</a> I appreciate any advice!</p>
  
  <pre><code>library(ggplot2)
  df1 &lt;- data.frame(HNF4_Looping_HiChIPvsRNASeq_VillusvsCrypt$HiChIP_log2FC_VillusvsCrypt, HNF4_Looping_HiChIPvsRNASeq_VillusvsCrypt$RNAseq_log2FC_VillusvsCrypt)
  ggplot(df1, aes(df$HNF4_Looping_HiChIPvsRNASeq_VillusvsCrypt.HiChIP_log2FC_VillusvsCrypt, df$HNF4_Looping_HiChIPvsRNASeq_VillusvsCrypt.RNAseq_log2FC_VillusvsCrypt))+                       
    stat_density_2d(aes(fill = ..level.. ), geom = "polygon")+scale_x_continuous(name="HiChIP_VillusvsCrypt", limits=c(-4,4))+scale_y_continuous(name="RNASeq_VillusvsCrypt", limits=c(-4,4))
  </code></pre>