90
20
15
E'
.E 10
O'l
·a.;
I
(f)
.s
5
20
15
.E 10
O'l
·a.;
I
(f)
5
Hans Winkler
-3
0
3
5
Signal-noise ratio {dB)
Excess attenu~tion {dB)
Fig. 4 A,B. Idealized representation of the vertical distribution of A top, signal-to-noise
ratio and B bottom, excess attenuation in a tropical rain forest at a sender to receiver
distance of 40 m. Data based on a regression of values measured in six species of antbirds
(five Thamnophilidae and one Formicariidae)