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\@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces \it  The attenuation, $\mathop {\mathgroup \symoperators ln}\nolimits (I/I_{0})$, as a function of the thickness of aluminium absorber in the x-ray beam with a silicon monochromator set to 5 keV. $\circ $ - experimental results; solid line - curve of best fit corresponding to an admixture of $(1.09 \pm 0.02)\% $ third-order harmonic (15 keV).  }}{3}}
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