Euclidean distance to the centre of gravity
of population in Europe

Mean elevation above sea level
....

Length of seashores in percent of region perimeter

Mean annual sunshine radiation in kWh/m2
(after Palz and Greif, 1995)

Major and secondary language

Accessibility by road to population in 1996

Accessibility by rail to population in 1996

Accessibility by air to GDP in 1996