Panel A: surface temperature, Ts, maps obtained in 3D magneto-thermal simulations. We show NS with initial dipolar poloidal magnetic field B0 = 1 × 1014 G at age 10 kyr. Panels B, C, D: the soft X-ray light-curves expected for this thermal map at 10 kyr. Panel B shows k = 30∘ panel C shows k = 60∘ and panel D shows k = 90∘. Dotted black lines correspond to i = 30∘, solid blue lines correspond to i = 60∘ and red dashed lines correspond to i = 90∘.