Selected standard deviations of single measurements are:
(Orthorhombic form)		(Tetragonal form)
25 °C	700 °C	700 °C	800 °C
SDa = 0.006 Å	0.013 Å	SD„ = 0.003 Å	0.004 Å
SDb = 0.010 Å	o.oio Å	SDr = 0.024 Å	0.023 Å
SDc = 0.019 Å	0.015 Å