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A $\mu$SR spectrometer is usually equipped with three pairs of Helmholtz coils: one longitudinal (${\mbox{\boldmath$H$\unboldmath}}$$\parallel$beamline), one vertical and one horizontal pair. These three magnets makes it possible to null the magnetic field at the sample position for zero-field (ZF) $\mu$SR measurements. The longitudinal magnet is also used to apply higher external magnetic field during the measurements.