[O] org-babel export table from R to LaTeX

[Riccardo Romoli]

Hi, I work with org-babel and R. 
In the R session I create a table that I have to export to LaTeX. 
This is the code I use:

#+headers: :results latex
#+begin_src R :session *R* :exports results
.....
  print(xtable(summary(mypca)))
#+end_src

I do not understand why the exported table is delimited by "|":

|% latex table generated in R 2.14.1 by xtable 1.6-0 package |
| % Tue Feb 14 16:21:48 2012 |
| \begin{table}[ht] | 
  | \begin{center} |
    | \begin{tabular}{rrrrrrrrrrrrrrrrr} | 
      | \hline |
      | & PC1 & PC2 & PC3 & PC4 & PC5 & PC6 & PC7 & PC8 & PC9 & PC10 &
      PC11 & PC12 & PC13 & PC14 & PC15 & PC16 \\ |
      | \hline | 
      | Standard deviation & 3.4693 & 2.8113 & 2.5561 & 2.2668 &
      2.0015 & 1.9236 & 1.7287 & 1.6220 & 1.4288 & 1.3456 & 1.2596 &
      1.2195 & 1.1278 & 1.0778 & 0.8390 & 0.0000 \\ | 
      | Proportion of Variance & 0.2188 & 0.1437 & 0.1188 & 0.0934 &
      0.0728 & 0.0673 & 0.0543 & 0.0478 & 0.0371 & 0.0329 & 0.0289 &
      0.0270 & 0.0231 & 0.0211 & 0.0128 & 0.0000 \\ |
      | Cumulative Proportion & 0.2188 & 0.3625 & 0.4813 & 0.5747 &
      0.6476 & 0.7149 & 0.7692 & 0.8170 & 0.8541 & 0.8871 & 0.9159 &
      0.9429 & 0.9661 & 0.9872 & 1.0000 & 1.0000 \\ | 
      | \hline |
      | \end{tabular} | 
    | \end{center} | 
  | \end{table} | 
| |

Should I change some headers settings??

Best