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The Webis-Editorials-18 corpus is a novel corpus with 1000 news editorials. In the paper, 'Challenge or Empower: Revisiting Argumentation Quality in a News Editorial Corpus', we introduce a new notion for news editorials quality based on whether an editorial brings readers of opposing beliefs closer together or rather increases the gap between them. For this reason, we create a Corpus that contains the quality assessments of 1000 news editorials, each annotated by three liberals and three conservatives. The annotators also reported free-text reasons for the effects they observed.