[Wien] How many angstroms is a a.u.?

[Pan Zhijun]

Hi,users of WIEN2K:
   How many angstroms is a a.u.? In the figure of energy vs volume,the volume unit of the horizonal coordinate is cubic a.u..I want to transform a.u.to angstrom.I have looked up many handbooks related to physics.But I failed to find the relation equation between the angstrom and a.u..Anybody know the transforming equation? Thank you in advance.

                                                       Pan Zhijun