About: http://webisa.webdatacommons.org/129034131

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Also, by choosing the appropriate steepness and spacing of the steps or the peaks, it is possible to avoid or eliminate problems such as spherical and other types of aberrations.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com