Energy-dependent attenuation of gamma rays for the line of sight towards the Crab Nebula: The solid and dashed lines are the attenuation calculated here (see text for details) for the anisotropic radiation field (solid) and for the assumption of an isotropic radiation field with identical energy density (dashed line). The dash-dotted line is the attenuation as calculated in the framework of a detailed Galactic dust emission model, however assuming an isotropic radiation field (LHAASO Collaboration 2021)