Numbers in multiview tool

So what do the numbers mean in the multiview tool? Probably not inches but what dimension is used then?

 

Metres, this is from the Config_DX11.ini
ViewParams=(0.540, 0.340, 0.600, 15.000, 0.037) // screen width (m), screen height (m), eye distance (m), side angle (deg), bezel gap (m)

 

Could have think about that myself... thanks!