RN colors in quiescence. The B − I and I − K colors were chosen as they have the broadest wavelength range, and hence the greatest sensitivity. V394 CrA (with B − I = 1.59 mag) is not included as it has never been detected in the JHK bands, so I − K is not known. V745 Sco is very red (due to its red giant plus a heavy extinction) and has the remarkably large B − K color or 12.1 mag. The arrow shows the change associated with normal extinction for E _{B− V} = 1.0 mag.