title: Smallest size of GGplot2 geom_text()
body: <p>I have a plot made with GGplot2. Now when i want to change the size of my text points within the plot, the size of the text does not change. I use the following line of code:</p>
  
  <pre><code>ggplot(data = out, aes(x = V2, y = V1)) +
      ****geom_text(data = out[!is.na(out$V1),], aes(label = labels, alpha=0.3, size=0.1))**** +
      facet_grid(id1 ~ id2,scales="fixed")+
      geom_text(data=df.text,aes(pos,pos,label=id1)) + geom_abline( slope=1 ) + 
      ggtitle("Corralation between measured &amp; calculated affinities") +
      ylab("") + xlab("") + theme(panel.grid.minor.x=element_blank(), panel.grid.major.x=element_blank())
  }
  </code></pre>
  
  <p>I put ** between start and end of the line of interest fat. I know that size is the right parameter to change, but why isn't my text changing when for instance making size=0.01.</p>