Fig. 3From: Distribution and prevalence of ticks and tick-borne disease on sheep and cattle farms in Great BritainRelative risk (RR) of farms reporting tick infestation in sheep (a) and cattle (b) in a retrospective questionnaire survey in Great Britain with tolerance contour lines overlain. Lighter colours indicate higher risk and areas with significantly higher risk (P < 0.05) shown by the bold contour. The colour scales show log and raw relative riskBack to article page