Assertion: astronomer's number | /r/HasProperty | required
Facets:
value: in order to produce a high quality image
type: PURPOSE
Source sentences:
text: In order to produce a high quality image, a large number of different separations between different telescopes are required (the projected separation between any two telescopes as seen from the radio source is called a "baseline") – as many different baselines as possible are required in order to get a good quality image.