how do I increase the spacing between lines of of wrapped text in merged cells

[mb]

Libre Office version 4.3.2.2
English
Spreadsheet

Mac OS 10.7.5
English

[AlexKemp]

Hi mb

Essentially, you cannot, whether in a single cell or merged cells.
(you can in Writer, not in Calc. Wot a PITA.)

LO-4.4.3.2 under Debian 6.0 en_GB