Selenium Xtal Structure?

[Uncle Al]

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Uncle Al needs a modern, very small "R" x-ray crystal structure for
gray selenium near ambient temp.  Is there anything better than

J. Phys. C 8 L445 (1975)
J. Phys. Chem. Solids 35 1089 (1974)
J. Appl. Cryst. 4 333 (1971)

e.g., in the ICSD?

I need the space group (152 or 154); a,b c unit cell dimensions; and
the unit cell fractional x-coordinate (if y=0.0 and z=1/3 do not
obtain, those too).

Thank you!

The same for tellurium would also be appreciated.

Phys. Rev. 16 4404 (1977)
Acta Cryst. C 45(6) 941 (1989)

Can we do better?

-- 
Uncle Al
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