** reference parts of tables
   :PROPERTIES:
   :DATE:     2009-11-20
   :END:

#+TBLNAME: squares
|  1 |   1 |
|  2 |   4 |
|  3 |   9 |
|  4 |  16 |
|  5 |  25 |
|  6 |  36 |
|  7 |  49 |
|  8 |  64 |
|  9 |  81 |
| 10 | 100 |
| 11 | 121 |
| 12 | 144 |
| 13 | 169 |
| 14 | 196 |
| 15 | 225 |
| 16 | 256 |
| 17 | 289 |
| 18 | 324 |
#+TBLFM: $2=$1*$1

#+begin_src gnuplot :var data=squares
set title "Implementing Gnuplot"
plot data using 1:2 with lines
#+end_src