Readers see red over low-impact graphics

Sir

Nature authors are increasingly using colour within figures. May I remind them and the graphics editors that a significant proportion of their readers, including me, cannot distinguish red from green? Issue number 7120, for example, was not atypical in having six figures that used these two colours. The impact of their figures — and just possibly the impact factor of the journal — will be improved if all the audience can see all the data.

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