Digital BW, The Print

Well, MIS overnighted me replacement UT carts w/tubes for my 1160 CIS,
no charge, after I discovered the inks had been pre-filled incorrectly
in my previous ones. Prints are looking pretty good, but I have a
question concerning the Roark curves for 1160 UT.

The readme included with them describes the UT11 and UT-EUS curves,
but doesn't mention the UT3k-EEM-blf curves, a set of which is also
included.

I assume they're for Epson Enhanced Matte, but does anyone know what
"UT3k" and "blf" refer to?

Thanks!

Neil