title: gap.plot: how to add on several variables?
body: <p>I would like to use gap.plot which makes a break in the x axis. But I need to plot three variables. I cannot figure out how to plot all three; my code plots only the last variable...</p>
  
  <pre><code>library(plotrix)
        par(bty="n") # deleting the box
        with(subset(data1, mechanism=='Inhibition'),gap.plot(day,BL.P, gap=c(51,116), gap.axis="Time (day)", xlab="Time (days)", ylab="Proportion",pch=16,
                                                             col="#0072B2"))
        with(subset(data1, mechanism=='Facilitation'), gap.plot(day,BL.P, gap=c(51,116), gap.axis="Time (day)", pch=16,
                                                                col="#D55E00"))
        with(subset(data1, mechanism=='Total'), gap.plot(day,BL.P, gap=c(51,116), gap.axis="Time (day)", xlab="Time (days)", ylab="Proportion",pch=16,
                                                                col="#000000",xtics=c(1,50,119,133)))
        abline(v=seq(from=50.5,to=53.5,by=.001), col="white")  # hiding vertical lines
  </code></pre>
  
  <p>Here is the figure with only one variable:</p>
  
  <p><a href="https://i.stack.imgur.com/l19es.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/l19es.jpg" alt="enter image description here"></a></p>
  
  <p>My data is here:
  <a href="https://www.dropbox.com/s/h8j895hklxeanyr/data1.csv?dl=0" rel="nofollow noreferrer">https://www.dropbox.com/s/h8j895hklxeanyr/data1.csv?dl=0</a></p>