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We comment on the recent work of Alcaraz and Malvezzi [1995 {\it J. Phys. A:Math. Gen.} {\bf 19} 1521] for the critical properties of the $S=1/2$ $XXZ$chain in staggered magnetic field. The method of determining the phase boundaryfrom the finite-size numerical data is also discussed.Comment: 5 pages, Plain TeX, 1 figure on reques

Critical properties of theXXZchain in an external staggered magnetic field