Mid-Spatial Frequency Error (PSD-2) of optics induced during CCOS and full-aperture polishingD. Liao, Z. Yuan, C. Tang, R. Xie and X. ChenJ. Eur. Opt. Soc.-Rapid Publ., 8 (2013) 13031DOI: https://doi.org/10.2971/jeos.2013.13031