Limits on the neutron star magnetic field and ṁ of a putative fallback disk in 1E 1207.4−5209, set by X-ray timing (Gotthelf & Halpern 2007) and by optical/infrared flux limits. Colors are as follows: (grey) – ruled out by X-ray timing; (red) – ruled out by total X-ray luminosity (assuming d = 2 kpc); (orange) – consistent with X-ray constraints but already ruled out by former Spitzer limits (Wang et al. 2007); (yellow) – consistent with X-ray constraints but ruled out by our HST limits; (green) – parameter region consistent with all constraints.