Endpoint regularity of $2$d Mumford-Shah minimizers

We prove an $\varepsilon$-regularity theorem at the endpoint of connected arcs for $2$-dimensional Mumford-Shah minimizers. In particular we show that, if in a given ball $B_r (x)$ the jump set of a given Mumford-Shah minimizer is sufficiently close, in the Hausdorff distance, to a radius of $B_r (x)$, then in a smaller ball the jump set is a connected arc which terminates at some interior point $y_0$ and it is $C^{1,\alpha}$ up to $y_0$.
Comment: This paper has been withdrawn by the authors due to a sign error in the last equation of system (2.11). In turn, this implies a change of sign of the last equation in the linearized system (3.1) as well. The linear three annuli property for solutions to the new system (3.1) is no longer valid