title: marking a point in the boxplot
body: <p>I am plotting three different sets as three boxplot in 1 page using ggplot2. In each set there is a point that I would like to highlight, and illustrate where the point stands compare to the others, is it inside the box ? or the outside.</p>
  
  <p>Here is my datapoint </p>
  
  <pre><code>    CDH     1KG     NHLBI
  CDH 301     688     1762
  RS0 204     560     21742
  RS1 158     1169    1406
  RS2 182     1945    1467
  RS3 256     2371    1631
  RS4 198     580     1765
  RS5 193     524     1429
  RS6 139     2551    1469
  RS7 188     702     1584
  RS8 142     4311    1461
  RS9 223     916     1591
  RS10 250    794     1406
  RS11 185    539     1270
  RS12 228    641     1786
  RS13 152    557     1677
  RS14 225    1970    1619
  RS15 196    458     1543
  RS16 203    2891    1528
  RS17 221    1542    1780
  RS18 258    1173    1850
  RS19 202    718     1651
  RS20 191    6314    1564
  
  
  library(ggplot2) 
  rm(list = ls())
  orig_table = read.table("thedata.csv", header = T, sep = ",")
  bb = orig_table # have copy of the data
  bb = bb[,-1] # since these points, the ones in the first raw are my interesting point, I exclude them from the sets for the time being
  tt = bb
  mydata = cbind(c(tt[,1], tt[,2], tt[,3]), c(rep(1,22),rep(2,22),rep(3,22))) # I form the dataframe
  data2 = cbind(c(301,688,1762),c(1,2,3)) # here is the points that I want to highlight - similar to the first raw
  colnames(data2) = c("num","gro")
  data2 = as.data.frame(data2) # I form them as a dataframe 
  
  colnames(mydata) = c("num","gro")
  mydata = as.data.frame(mydata)
  mydata$gro = factor(mydata$gro, levels=c(1,2,3))
  qplot(gro, num, data=mydata, geom=c("boxplot"))+scale_y_log10() # I am making the dataframe out of 21 other ponts
  # and here I want to highlight those three values in the "data2" dataframe
  </code></pre>
  
  <p>I appreciate your help</p>