The horizontal black dashed lines show the 2011, 2015 and now our 2018 trading range that are all the same height. (moneytalks.net)
Black vertical dashed lines indicate the years 1938 - 43. (skepticalscience.com)
The black dashed line shows the original, dark - matter - only model predictions; the black solid line includes the effects of detectability. (aasnova.org)