title: Boxplot and xyplot overlapped
body: <p>I've done a conditional boxplot with my data, with the <code>bwplot</code> function of the <code>lattice</code> library.  </p>
  
  <pre><code>    A1 &lt;- bwplot(measure ~ month | plot , data = prueba,
                strip = strip.custom(bg = 'white'),   
                cex = .8, layout = c(2, 2),
                xlab = "Month", ylab = "Total",
                par.settings = list(
                  box.rectangle = list(col = 1),
                  box.umbrella  = list(col = 1),
                  plot.symbol   = list(cex = .8, col = 1)),
                scales = list(x = list(relation = "same"),
                              y = list(relation = "same")))
  </code></pre>
  
  <p>Then, I've done a xyplot because I want to add the precipitation data to the previous graph, using <code>xyplot</code> from <code>lattice</code> library also.  </p>
  
  <pre><code>    B1 &lt;- xyplot(precip ~ month | plot, data=prueba,
     type="b",
     ylab = '% precip',
     xlab = 'month',
     strip = function(bg = 'white', ...)
       strip.default(bg = 'white', ...),
     scales = list(alternating = F,
                   x=list(relation = 'same'),
                   y=list(relation = 'same')))
  </code></pre>
  
  <p>I've try to draw them on the same graph using <code>grid.arrange</code> from <code>gridExtra</code> library:</p>
  
  <pre><code>    grid.arrange(A1,B1)
  </code></pre>
  
  <p>But with this, I don't overlap the data, but the result is this
  <img src="https://i.stack.imgur.com/h3F3g.jpg" alt="boxplot and xyplot"></p>
  
  <p>How could I draw the precipitacion data "inside" the boxplots conditioned by plot?</p>
  
  <p>Thank you</p>