A sign confusion crept into the calculations leading to Proposition 3.2 of the above article: the normalisation of Po,-.-,P, used in Sect. 1 to define the Eisenstein symbol does not lead to the usual Steinberg symbol in the case of K2. Thus the first displayed formula following 3.1 (p. 311) should read This has the effect of replacing the term d 'j(v-~t) Further results are not affected.
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