latex *pk files in /var?

[Marcelo Chiapparini]

Hi!
after running xdvi I noted that several *pk files appeared in
/var/spool/texmf/pk/ljfour/public/cm. Why this? 
Thanks in advance,
Marcelo 

-- 
Marcelo Chiapparini
DFT-IF/UERJ
[EMAIL PROTECTED]