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We apply a generalization of the time-dependent DMRG to study finitetemperature properties of several quantum spin chains, including the frustrated$J_1-J_2$ model. We discuss several practical issues with the method, includinguse of quantum numbers and finite size effects. We compare with transfer-matrixDMRG, finding that both methods produce excellent results.Comment: 4 pages and 4 figure

Finite-temperature density matrix renormalization using an enlarged Hilbert space