problem with the space below a tablature

[caserta pierre]

To illustrate my problem I joined 3 files that are:
- header is a file I include in the exemple.ly
- exemple.ly is a simple tablature
- example.pdf is the result of the lilypond compilation

the problem is that there is a large space between the last tab and the 
bottom of the page. (the actual height is 7cm)
If I change the value:  ''paper-height''  and reduce a little the height 
 of the page (6.8cm), lilypond create 2 pages.
I just want a pdf as small as possible with just the tablature on 1 page.

As you can see I changed the property of the paper in the header file:
\paper
{
   make-footer=##f
   make-header=##f
   left-margin = 0\cm
   top-margin = 0\cm
   bottom-margin = 0\cm
   indent = 0\cm
   between-system-padding = 1\mm
   paper-width = 7.5\cm
   line-width = 7\cm
   paper-height = 1.6\cm
}

the default value for paper-height is 1.6cm but I change this value in 
example.ly

I do not understand the problem.
Can you help me with that ?

Sincerly
Pierre Caserta

header
Description: Text document

example.pdf
Description: Adobe PDF document

example.ly
Description: Text document