Sunday Mail Bare Bones

[Jaycee47]

Can somebody please enlighten me?
Snake has space in a tree = Aspen. I can see that Asp is snake and Aspen is a tree but what has space and en got in common?

[bulliver]

en - a space in printing

http://www.thefreedictionary.com/en

[Lie-in King]

'en' is a unit of measurement used in printing - 1/2 of an 'em'

[Ouzel]

An en is a space in printing.

[Calibax]

En is a printing term for a small space

[Jaycee47]

Many thanks everyone.