Sorting a column without altering other columns

I'm trying to sort the third column without altering ther first two
columns, but to no avail:

1. LARGEST 40
2. SECOND-LARGEST 168
3. MID 2.8
4. MID 540
5. MID 14.84
6. MID 40
7. SECOND-LEAST 64
8. LEAST 8

I've tried to use the B command of the vis.vim plugin, as in:
'<,'>B sort n

but it doesn't work.

Many thanks in advance

--
Cesar

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