Cibachrome filter factors

Hi all,
is there anybody knowing the filter factors for each filter of the set of Cibachrome A filters? Where can I find these data? They are not written on the pack...
Thank you!
Damiano

I use the Ilford EM-10, it's basically a light meter used at the easel. I have had great results using it so I never have to change my print time with cibachromes, so I avoid any color shift with reciprocity due to a change in print time...... for less than $30 it's well worth it.

You may want to refer to the book "The Complete Guide To Cibachrome Printing" by Krause & Shull. It is out of print but fairly easy to find. The is a table in the book as follows:
Yellow: ±(.05CC to .5CC) change ±10% or make no change at all
Magenta: (±.05CC)change±20%, (±.1CC)change ±30%, (±.2CC)change ±50%, (±.3CC)change ±70%
Cyan: (±.05CC)change ±10%, (±.1CC)change ±20%, (±.2CC)change±30%, (±.3CC)change ±40%