Other exterior changes include underbody diffusers and the rear diffuser shared with the 488 GTE. This is especially true for Linear slot diffuser and 'perf' diffusers. The bodywork was modified to include front and rear diffusers and louvers for improved aerodynamics. Hair dryers are available with attachments, such as diffusers, airflow concentrators, and comb nozzles. Reflecting diffusers for photography are generally called "reflectors". See table of sub-supersonic diffusers and nozzles. Diffractive diffusers are commonly used in commercially available LED illumination systems. Mechanical pumping is typically provided by steam ejector/diffusers. Specially designed floor diffusers are used as the supply outlets. Difficulties with the diffusers and pumps paled into insignificance besides those with the porous barrier. Reflective diffusers can be easily characterised by scatterometers. In Spain, front wing endplates and rear diffusers were reduced in size. Recently, photopolymers have been used for making holographic diffusers. Hybrid versions of vaned diffusers include&colon; wedge, channel, and pipe diffusers. Nebulizer is a device that doesn't use water or heat as other diffusers.