Table 2. Structural parameters from the reciprocal- and direct-space refinements of Si at 100 and 300 K.

Parameters	Reciprocal space	Direct space
For 100 K
a (Å)	5.430014 (3)	5.430057 (1)
U Si (10−4 Å2)	29.7 (3)	30.0 (1)
R wp (%)	6.05	6.41
For 300 K
a (Å)	5.431302 (3)	5.431324 (1)
U Si (10−4 Å2)	57.7 (3)	59.5 (1)
R wp (%)	6.30	6.06