Le jeudi 16 d�cembre 2004 � 16:22 +0100, Jean-Pierre Coulon a �crit :
> On Thu, 16 Dec 2004, Col. G. L. Sicherman wrote:
> 
> > On Thu, Dec 16, 2004 at 10:35:33AM +0100, Jean-Pierre Coulon wrote:
> >>
> >> Does any one knows some way to make ledger lines slightly thicker than
> >> regular staff lines in MusiXTeX ? I think this would improve readability of
> >> such notes.
> >
> > In my copy of musixtex.tex, the relevant definition is [EMAIL PROTECTED]:
> >
> >     [EMAIL PROTECTED]
> >       [EMAIL PROTECTED]@v\internote
> >       [EMAIL PROTECTED]@ii
> >       [EMAIL PROTECTED]
> >       [EMAIL PROTECTED]
> >     ...
> >
> > You could try replacing \hlthick with 1.5\hlthick or 2\hlthick.  The
> > normal value of \hlthick is 0.2pt, making the line thickness 0.4pt.
> > I agree that it's thin.
> 
> 2\hlthick works fine, but is a bit too thick. What is the right syntax to
> say 1.5\hlthick in TeX ? It complains "Illegal unit of measure" if I say
> this verbatim (I'm to a TeXpert :-)

\hlthick is not a dimen register but a macro:
[EMAIL PROTECTED]
and the dimen register is \lthick with default value .4pt

The easiest is to code

\def\myhlthick{1.5\lthick}
[EMAIL PROTECTED]
  [EMAIL PROTECTED]@v\internote
  [EMAIL PROTECTED]@ii
  [EMAIL PROTECTED]
  [EMAIL PROTECTED]
...

Olivier

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