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====== Errata ====== The authors apologise for any errors that were inadvertantly made in the book. We will list any errors here. Please let us know of any you spot. P39, Eqn 2.35 - the negative sign is incorrect, it should be + P40, Table 2.2 - the monochromator angles for Mo-Ka1 radiation in Table 2.2 are incorrect. For Ge(111) the correct angle is 12.4 degrees; for Ge(220) the correct angle is 20.4 degrees.