insert @6=vsum(@I..@II) interactively HOWTO?

[Uwe Brauer]

>>> "UB" == Uwe Brauer <o...@mat.ucm.es> writes:

>>> "UB" == Uwe Brauer <o...@mat.ucm.es> writes:
>> Hi



> | result1 | result2 | result3 |
> |---------+---------+---------|
> |      14 |       5 |       1 |
> |       3 |       5 |       3 |
> |       4 |      19 |       4 |
> |       6 |       3 |       8 |
> |---------+---------+---------|
> |      27 |      32 |      16 |

> #+TBLFM: @6=vsum(@I..@II)

Why can't I insert this interactively?

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