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[David Allouche <address@hidden>]

On Friday 29 March 2002 08:32, Nirmal Govind wrote:
> Under the Documents->Paragraph->Spacing, what's the difference between
> interline separation and interline spacing? And what are the units of the
> value that we should be entering for these? Say, I want double spacing
> between the lines, then how do I do this?

After some source code reading and some experimentation I eventually got it 
and put in on the Wiki:

http://alqua.com/tmresources/environment%20variables%20for%20paragraghs

'interline space'
 - type: length
 The minimum length between the ink of two successive lines of the same 
paragragh.
 This variable is set by menu items labeled 'interline separation'.

'line stretch'
  - type: space
  Stretchable space inserted between successive lines of the same paragraph 
when filling a page. To produce the expected behaviour, the variable value 
should be set to use 'fn*' length unit. It is the only space unit relative to 
the font heigth and with a nominal value of 0.
  This variable is set by menu items labeled 'interline space'.

The 'line stretch' (stretchable) and 'interline space' (rigid) variables are 
complementary variables. They allow to independently set the rigid and 
stretchable parts of the line spacing.

I also came up with a better understanding of length units. There not only 
absolute and relative length units, but also *space units*, that contain 
upper and lower bounds for stretching and are affected by the 
page->breaking->flexibility.

I updated the two pages about length units:
http://alqua.com/tmresources/how%20to%20use%20length%20units
http://alqua.com/tmresources/length%20units
to talk of stretchable spaces.

Double spacing is obtained by setting the 'interline space' typesetter 
variable to about 1fn. Sine the default value is 0.2fn, I would use 1.2fn.

WARNING: the 'interline space' variable is set by the 'interline separation' 
menu item, while the 'interline space' menu item (deceptive name!) sets the 
'line stretch' variable.
-- 

                                  -- David --