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The Org Mode 7 Reference Manual
by Carsten Dominik and others
Paperback (6"x9"), 282 pages
ISBN 9781906966089
RRP £9.95 ($14.95)

Sales of this book support the Org project! Get a printed copy>>> :colnames

The :colnames header argument accepts the values yes, no, or nil for unassigned. The default value is nil.

If an input table looks like it has column names (because its second row is an hline), then the column names will be removed from the table before processing, then reapplied to the results.
#+tblname: less-cols
| a |
| b |
| c |

#+srcname: echo-table-again
#+begin_src python :var tab=less-cols
  return [[val + '*' for val in row] for row in tab]

#+results: echo-table-again
| a  |
| b* |
| c* |
No column name pre-processing takes place
Column names are removed and reapplied as with nil even if the table does not “look like” it has column names (i.e. the second row is not an hline)
ISBN 9781906966089The Org Mode 7 Reference ManualSee the print edition