Reference work entry
Diffuse, quasi-circular region distinguished from its surroundings by radar backscatter cross section (bright, dark, or a combination of bright and dark annuli).
Splotches are radar-dark or radar-light diffuse, roughly circular regions on the surface of a crusty planetary body (Fig. 1). They are distinguished from their surroundings by radar backscatter cross section (radar albedo). The bright parts are not nearly as bright as the blocky continuous crater ejecta, and the dark parts are not entirely featureless.
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