title: Technique for absolute definition of spherical surface errors: its use in interferogram analysis.
abstract: A technique for defining the absolute surface errors of a spherical surface is described. This technique does not require explicitly finding the best-fitting sphere, and it is useful in the interferometric evaluation of absolute surface errors.
authors.forename: J S
authors.initials: JS
authors.lastname: Harris
authors.forename: H H
authors.initials: HH
authors.lastname: Hopkins