Example pdf: http://www.atmos-meas-tech.net/6/2169/2013/amt-6-2169-2013.pdf

Throughout this document, the greek letter \mu is not shown, just
white space instead. See e.g. page 2177, right column, bottom line:
"about 4  rad" should be "about 4 μrad".

This can be seen (or rather not seen) in evince and xpdf. It works in
older versions of evince (wheezy's evince 3.4 works), and it works in
iceweasel's build-in pdf viewer.


thanks for considering

Florian