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F:g.6 GIS to support the phases of the project of conservation: the cognitive process, the constructive and technological 
analysis, the materical and stratigraphicai analysis, the maps of degree, of the pathologies, and at last the project of 
the intervention on the monument. The different shapes mapped are related to descriptive data bank. Here are 
represented the homogeneous stratigraphicai units in the masonry of the front related to the hypothesis of the 
chronological sequences of construction and restorations during the centuries.