From mboxrd@z Thu Jan  1 00:00:00 1970
From: Uwe Brauer <oub@mat.ucm.es>
Subject: Re: extract a region from a table and export it
Date: Thu, 16 Jun 2016 16:16:03 +0000
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   > Uwe Brauer <oub@mat.ucm.es> writes:

   > See (info "(org) var") in particular the section on "Indexable variable
   > values".


   >         Additionally, an empty index, or the single character ‘*’, are both
   >      interpreted to mean the entire range and as such are equivalent to
   >      ‘0:-1’, as shown in the following example in which the entire first
   >      column is referenced.

   >           #+NAME: example-table
   >           | 1 | a |

   >           | 2 | b |
   >           | 3 | c |
   >           | 4 | d |

   >           #+BEGIN_SRC emacs-lisp :var data=example-table[,0]
   >             data
   >           #+END_SRC

   >           #+RESULTS:
   >           | 1 | 2 | 3 | 4 |

It is also not clear to me how you could extract say the first and the
third column from the following table

| 1 | a | 3 |
| 2 | b | 4 |
| 3 | c | 6 |
| 4 | d | 7 |

Using your approach?