But you could collect this data point by chance in a bigger or smaller detector. What I was addressing was whether this detector is big enough for a reliable d

But you could collect this data point by chance in a bigger or smaller detector. What I was addressing was whether this detector is big enough for a reliable discovery. In that case what you really want to constrain is the rate, such-and-such events per kilogram of xenon per year (the per-kilogram-of-xenon can be traded for a per-liter rate given the density of the xenon).