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Using the full potential linearized augmented plane wave plus local orbitalsmethod we determine ab-initio the lattice parameters of tetragonally distortedCo2TiSn in the L21 structure. The tetragonal lattice parameter c is determinedas a function of the lattice parameter a by energy minimization. The change intotal energy is found to be only a few $k_B T$ with respect to roomtemperature. The spin polarizations as well as the magnetizations are stableagainst small lattice distortions. It is shown, that the volume is not constantupon distortion and that the volume change is related with significant changesin the magnetization and the gap energy.

Influence of tetragonal distortion on the magnetic and electronic properties of the Heusler compound Co2TiSn from first principles