Graph illustrating the differences between thermometer - based estimates (thick black line = CRUTEM3, thick red line = Central Europe Temperature) and various proxy - based estimates (other lines) of temperatures over the 19th century. (globalwarmingsolved.com)
Break - up timing and solar shortwave energy incident at the surface (mean and cumulative shown on bottom and left axis, respectively) for 2009 (thick red line = observed as of July 6; thinner dark red line = forecast) and other recent years. (searcharcticscience.org)
Then he spelled words on his own, tracing the English letters into his tablet in a thick red line. (phys.org)