[ccp4bb] Wavelength of Copper Kalpha

[Jim Pflugrath]

It has come to my attention that the wavelength of a Copper Kalpha may 
have changed over the years.  At least this appears to be true if you look 
at the International Tables.

What is the currently approved wavelength in Angstrom of a Copper Kalpha 
X-ray produced by a X-ray generator with a copper anode to 6 decimal 
points?  In your response, please tell us how you arrived at that 
wavelength and how you weighted any alpha1, alpha2, etc components.

Thanks!  Jim