When I was born, my big brother went into such a state of denial that he used to paint pictures that consisted of solid lines of black paint. (ababyonboard.com)
The thinner gray solid line shows the projection using the data available as of the last quarter of 2006, before the financial crisis. (frbsf.org)
The black solid line represents the mediation effect, whereas the black dotted lines represent a 95 % credibility interval. (frontiersin.org)