Greg Rudd wrote: > This is caused by 2 factors: > > 1. Reciprosity > > 2. Colour shifts Now you are starting to sound like Phil Longley. -- David Johnson trainman@ozemail.com.au http://www.ozemail.com.au/~trainman/ ------------------------------------ These comments are made in a private capacity and do not represent the official view of State Rail. C.O.W.S. Page 11.