Value of "Spaces" in Layout Options dialog

What is the signification of the “Spaces” in Layout Options dialog > Vertical spacing ?
Is it proportional to the size selected in Layout Options dialog > Page Setup > Space Size ? Or is it an absolute value?
Thank you by forehand.

Koenraad

Yes, “space” is whatever you set “space size” to be, so it is not an absolute value.

Thank you Dan. That’s not so obvious in French version of Dorico.