HI, am running Aperture 3. Have created a new library, Library 1. This i placed in pictures in Finder. Have imported photos into Library 1, but as referenced files in a folder. The size of this library 1 is 20Gb, my question is, in pictures where Library 1 has its little icon, i am told it is about 1.5Gb. What is this 1.5Gb from, as the photos are not stored in the Aperture Library?