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Fig. 1. The four main classes of possible home vector. Left, geocentric rectangular (x,y) and polar (r,{gamma}); right, egocentric rectangular (x',y') and polar (r',{gamma}'). N is the nest position, A is the animal's position, the short arrow indicating its orientation. We use the convention of measuring angles as positive anti-clockwise from the x-axis or from the animal's body axis.





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