The cover has a reinforced foil section (2), and a retaining and/or clamping device that is used for firmly pulling the foil section to or via a surface. The reinforced foil section is form-reinforced so that the section maintains a smooth form. The reinforced foil section is formed in a rectangular manner and extends from an opposite edge of the cover. The reinforced foil section exhibits transparency within an infra-red light wavelength range and/or within a visible light wave length range.
