I want to put some parts of my document in Helvetica Neue UltraLight italic.
I use :
\fontspec{Helvetica Neue Ultralight} \selectfont
\emph{...} ...
or :
\textit{...} ...
But none of 2 solutions seems to work, as the result is in Helvetica Neue LIGHT italic
I checked that the font I want exists on my computer, in a whole HelveticaNeue.dfont package.