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Fig. 3. Sound intensity response curves created by logistic fit of the behavioural
data shown in Fig. 2
(20<N<25 for all intensity/odour combinations). Significance
level and McFadden rho2 are as follows: Air (P<0.001, rho2=0.300),
1 component (comp.) (Z9E11-14:OAc) 20 ng (P<0.001, rho2=0.242), 1
comp. 100 ng (P<0.001, rho2=0.192), 2 comp. blend (Z9E11-14:OAc
and Z9E12-14:OAc) (P<0.001, rho2=0.123), Female extract
(P<0.01, rho2=0.158). The vertical broken lines indicate the 50%
threshold sound intensity for air and female extract.