TaxiwayParking Radius vs Diameter for AIG

Editing airports in the SDK I see that the parking spots dimensions are set in meters, indicating the Radius: GateHeavy are about 30-35mt, GateMedium about 23-28mt, and so on.
I set a parking with 40mt Radius (diameter 80mt), but if I look at the airport scenery, with vehicles and other objects around that parking spot, it does not look 80mt wide, but 40mt (80mt would fit 15-16 boarding stairs one behind the other, and they don’t).
So, this Radius is the radius or it’s the Diameter, but called in the wrong way?