Fig. 4. The landmark panorama within the landmark square provided four alternative positions where the ants could search for the fictive nest. The box-plot representation depicts the median number of positions at which the ants were recorded searching for the nest. Median values (filled squares) are given for the four directions from which the ants had been released. Releases from southeast correspond to releases from the training direction. Limits for minimum and maximum values (lines above and below the boxes) and 25-75% percentile ranges (open boxes) are given. N=16 (NW), N=18 (NE), N=20 (SW) and N=22 (SE) ants (same data pool as that represented in Fig. 2). For further information, see the text.