Assertion: vertical bar | /r/HasProperty | middle one
Facets:
Source sentences:
text: It comprises three small vertical bars, a rightmost one with intensity 4% above black level (11.5 IRE), a middle one with intensity exactly equal to black (7.5 IRE), and a leftmost one with intensity 4% below black (super-black or "blacker than black", 3.5 IRE).