It all makes sense now, thanks for your valuable input to what has turned out to be an interesting topic of discussion within the fraternity here. The link you posted was provided a top explanation.
My next question though is what altitude information is displayed on your TCAS display on the adjacent traffic as this once again could differ to what the ATC radars would be displaying if it is derived from the transponder/tcas equipment only based on 1013.
Shukran, hope to see you back through this patch again someday.
