The negative control is shown in bottom right hand panel - for the negative control, purified ab32518 was used at a dilution of 1/50 followed by ab150120, Alexa Fluor ® 594 goat anti-mouse antibody at a dilution of 1/500. (abcam.com)
Another is a wonderful lower right hand panel in smoky greys and black disguising another diamond. (hamptonsarthub.com)
[Response: The graphs are I think direct pulls from the NODC website, but we show the errors in our own publications i.e. right hand panel here: — gavin] (realclimate.org)