TY - CONF AU - Ulf Griesmann AU - Jan Burke C2 - Interferometry XVI: Techniques and Analysis, Monterey, CA DA - 2012-09-13 DO - https://doi.org/10.1117/12.929968 LA - en M1 - 8493 PB - Interferometry XVI: Techniques and Analysis, Monterey, CA PY - 2012 TI - Calibrating the sag due to gravity of horizontal interferometer reference flats ER -