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in Default Lyx PDF output, (I presumed it is pdflatex), I used fontdimen2/3/4 to control the interword space, stretch and shrink. In a project, I had to use XeTeX for a particular font. However, the fontdimen2/3/4 doesn't work on the regular text anymore under XeTeX. Only works on fancyhdr.

My Preamble as regards to the text sizes are following:

 %Set word space
\fontdimen2\font=0.15em% interword space
  \fontdimen3\font=0.15em% interword stretch
  \fontdimen4\font=0.1em% interword shrink

%set font size

In order to test the functioning, I set all fontdimen to 0, as you observed in the following example, only the fancyhdr is affected. the font I am using is Van Dijck MT Std with Old Style Figures on.

fontdimen to 0

share|improve this question
@DavidCarlisle accidentally pasted that in, wasn't being relevant, thanks for pointing it out. – Shi Yuan Oct 2 '12 at 15:43
You should supply an example, in particular the font you're using. Notice that special spacing is used when XeCJK is involved. – egreg Oct 2 '12 at 16:05
@egreg thanks for the suggestion, I have updated the question. – Shi Yuan Oct 3 '12 at 11:49
Did you try with other fonts? – egreg Oct 3 '12 at 11:59
@egreg, just tried Adobe Garamond, Adobe Caslon and the Arial, all have the same problem. – Shi Yuan Oct 3 '12 at 12:18

my own problem, found the answer. I used ragged2e to make the type set ragging right. However, it needs to be placed under the everysel. if everysel is before ragged2e, the fontdimen won't work.

share|improve this answer
Which shows why we always ask for a minimal working example (MWE). In this particular case, ragged2e uses \spaceskip for the interword spacing, so the \fontdimen parameters are ignored. – egreg Oct 3 '12 at 12:43

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