Fig. 8. The original densities of 100 to 125 were mapped or expanded to 1 to 256 levels of grey (f= 4, t = 1/8 sec.).

In Figure 8 the original densities of 100 to 125 were mapped or expanded to 1 to 256 levels of grey to demonstrate extremely subtle optical density changes, mainly in the area of the disc's dark regions and edge.

In Figure 9 the original densities of 175 to 200 were mapped to 1 to 256 levels of grey. The dark and light regions on top of the disc become more evident here as does the apparent third dimension of the object.

In Figure 10 a wider variety of colors were used to better emphasize the disc's surface density differences as well as the lake's luminance distribution. Located above the disc is a generally oval shaped region of higher density (darker). However, it cannot be the shadow of the disc on the water's surface because it is in the wrong position relative to the sun.

On October 25, 1986 at about 9:00 am, by clear weather, two men saw an object at the surface of the Lago de Cote. They are Joaquin U.A., 40 years old, a farm manager, and Ronald-Alberto L.A., a 23-year-old farmer. Their sketch of what they saw is presented as Figure 11.

Interviewed at the site 2 weeks after the observation by Ricardo and