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Melles Griot Absolute™ transmission flats cost-effectively increase the absolute accuracy of Zygo®-style fizeau surface- and wavefront-testing interferometers to λ/50 (peak to valley), without the need to store, manipulate, or subtract reference wavefronts during the testing process. When reference wavefront subtraction is employed, the absolute accuracy is significantly greater than λ/50 (peak to valley). Absolute fizeau transmission and reference flats are produced using advanced subaperture stitching interferometry (SSI®) and magnetorheological finishing (MRF®).