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Bovedilla perfeccionada, formada por una pieza de materia cerámica hueca simétrica en sus dos mitades con sus caras superior e inferior planas, prolongándose la inferior superiormente a través de dos tramos verticales, que tras un pequeño tramo sensiblemente horizontal enlaza con un acodamiento convexo que tras un trecho vertical y remate curvo-convexo enlaza con la cara superior.