Caglioti U V W parameters

[Stefan Berger]

Dear All,

i am a little bit confused about the magnitudes of the U V W profile parameters 
of the caglioti function for instrumental broadening. Is it true, that U and W 
are always positiv (larger 0) and V is always smaller 0 (negativ)?

Thanks for your hints and explanations.

Best Regards,

Stefan