Mode-S in Central Europe interrogates MCP/FMS set altitude and QNH setting (FMS for Airbus, which is usually the origin or the destination)
The required equipment is mandatory for the Central Europe airspace.
However the resolution of the data transmitted is 100 feet.
So 13,008 or 96 feet is fake.
A full set of available Mode-S data can be found here
http://rtl1090.web99.de/homepage/ind...=X&PIDX=104415