(a) The average consonant scores in listener sets 1 [Pc(LS1)] and 2 [Pc(LS2)] for the six common listeners 12L, 48R, 76L, 112R, 113R, and 134L. (b) Same as (a), but with average consonant scores estimated using only unbiased consonants, as discussed in the text. The dotted lines parallel to diagonal represent ±15% difference (∣ΔPc∣=∣Pc(LS2)−Pc(LS1)∣=15%).