Invariant-mass distributions of $\DtoKpi$ candidates (andcharge conjugates) in pp collisions at $\sqrts=7 \TeV$ fortwo $\pt$ intervals: $0< \pt< 1 \gev/c$ (top panels) and $1< \pt< 2 \gev/c$(bottom panels). For both $\pt$ intervals, the left panels displaythe invariant-mass distribution of all ULS K$\pi$ pairs together with thebackground distributions estimated with the LS, event-mixing andtrack-rotation techniques. The middle and right panels show the invariant-massdistributions after subtraction of the background from the track-rotationand LS techniques. Fit functions are superimposed.