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Fig. 4. (A) Thermogram of two mice, scaled for an 80° field of view with the
animals 45 cm distant. Images were recorded at an air temperature of 15°C
in sparse scrub habitat around midnight, following a mostly cloudy afternoon.
(B–D) Image A convoluted with circular spread functions chosen to
visualize the image along the optic axis of the facial pit. (E–G) Image
A convoluted with elliptical spread functions to visualize imaging directly in
front of the snake (right column). The 
i indicated for each
row is the aperture angle of a circular spread function (B–D), and the
vertical i of an elliptical spread function (E–G). The
minor axis i of the ellipse is half that of the vertical
axis. The temperature contrast in these images is quite low, so for clarity we
have assumed a larger pit and greater membrane sensitivity (color steps of
0.0005°C) than in Fig. 3.
Note that, particularly for large i (poor resolution), the
warmest part of the image is a large, warm area of ground and not the
mice.
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