LyX ⇒ Reduce vertical spacing in Covington examples

[trinityman]

I'm using LyX 2.0.7 on Ubuntu 13.10. I have a lot of examples using the Covington package (usually but not always along with the ExPex package in ERT) and there is way too much vertical space between the end of the paragraph that precedes it and the start of the text. How can I reduce it?