Assertion: radio telescope's surface | /r/HasProperty | perfect
Facets:
value: with deviating from an exact parabola
type: OTHER
value: almost
type: DEGREE
Source sentences:
text: The surfaces of its dozens of radio dishes are almost perfect, with none deviating from an exact parabola by more than 20 micrometers (20 millionths of a meter, or about 0.00078 inches).