Classifier Instance:

Anchor text: Cygnus X-1
Target Entity: Cygnus_X\u002d1
Preceding Context: The first strong candidate for a black hole,
Succeeding Context: , was discovered in this way by Charles Thomas Bolton, Louise Webster and Paul Murdin in 1972. Some doubt, however, remained due to the uncertainties resultant from the companion star being much heavier than the candidate black hole. Currently, better candidates for black holes are found in a class of X-ray binaries called soft X-ray transients. In this class of system the companion star is relatively low mass allowing for more accurate estimates in the black hole mass. Moreover, these systems are only active in X-ray for several months once every 10–50 years. During the period of low X-ray emission (called quiescence), the accretion disc is extremely faint allowing for detailed observation of the companion star during this period. One of the best such candidates is V404 Cyg.
Paragraph Title: X-ray binaries
Source Page: Black hole

Ground Truth Types:

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Predicted Types:

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wordnet_land_109334396-1.6191337113402755 0
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