Spin-down power Ė and γ-ray efficiency η as a function of the distance, for PSR J0610−2100. Ė_Shk denotes the Shklovskii correction to Ė, Ė_Gal is the contribution from the line of sight acceleration in the Galactic potential, and Ė_int is the spin-down power obtained after correction for these effects. The blue curve represents the γ-ray efficiency, η (the y-axis scale is in percent), and the gray-shaded area shows the region excluded by the condition η> 0. Finally, the red dashed line shows the NE2001-predicted distance for PSR J0610−2100 of 3.54 kpc, and the green-shaded region represents the zone excluded by the 2σ lower limit on the distance from our timing analysis, of 0.77 kpc.