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We use the density matrix renormalization group (DMRG) for transfer matricesto numerically calculate impurity corrections to thermodynamic properties. Themethod is applied to two impurity models in the spin-1/2 chain, namely a weaklink in the chain and an external impurity spin. The numerical analysisconfirms the field theory calculations and gives new results for the crossoverbehavior.

Impurity corrections to the thermodynamics in spin chains using a transfer-matrix DMRG method