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. 2011 Jul 20;6(7):e21927. doi: 10.1371/journal.pone.0021927

Figure 2. Earthworm behavior in four arm olfactometer.

Figure 2

Observed and theoretical (i.e. random) distributions of earthworms in each arm of the four-arm olfactometer when one arm is treated with (a) G. candidum filtrate, (b) ethyl pentanoate (100% v/v), or (c) ethyl hexanoate (100% v/v). The distributions are compared by a Chi-square Goodness-of-fit test.