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            MaterialColor glass from Schott or equivalent
            Dimension Tolerance+0.00/-0.10mm
            Thickness Tolerance±0.20mm
            Clear Aperture>90%
            Parallelism< 30", up to 3"
            Surface Quality60-40 commonly, up to 40-20
            Flatnessλ/4 commonly, up to λ/10
            ChamferProtective Bevel <0.25mmx45deg

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