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Fig. 8. The percentage of choice frequency (mean ± S.E.M.) plotted against e-vector orientation when fish C was re-trained to swim towards 45° e-vector orientation. The left side of the figure shows the choice frequencies between the reference 45° and the comparison e-vectors of up to 0°, and the right side shows the choice frequencies between 45° and the comparison e-vectors up to 90°. The horizontal shaded bands represent the range of choice frequency values that correspond to significance levels of P=0.001≤x, P=0.01≤x≤0.001 and P=0.05≤x≤0.01, calculated using the binomial distribution model of Bernoulli trials for 40 trials. Except for the 55° e-vector comparison, points and their associated significance levels on the right side of the figure are for less than 40 trials. The smallest {Delta} e-vector was approximately 10°.