alignment marks sizes

[Thomas E. Jerde]

I am making a design for a mask and I need to know approximately what 
size the alignment marks should be for use on karlsuss.  I have a 
good idea what they should look like, and how successively smaller 
sizes are useful, but I have no scale info about what diameter the 
largest mark should be.

I'd really appreciate any info!

Thanks,
thomas
tjerde at stanford.edu