Assertion: unit | /r/HasProperty | 10-13 m.
Facets:
value: approximately
type: TEMPORAL
Source sentences:
text: Before 1965, most x-ray wavelengths were expressed in terms of the X-unit, which is approximately 10-13 m. The X-unit has been superseded by the A* unit, which is based on the tungsten Kα 1 line as a standard.