The basement in the courtyard at elevation 569.52 m a.s.l. has an entrance through a stone rectangular portal from the courtyard. The space, accessible by stairs, has a floor made of steamed clay and is vaulted with a barrel vault with lunettes; on the south wall there is a ventilation opening to the facade of the square. Samples of building stone (SB) and solid fired brick (BB) were taken from the northeastern wall, the construction of which dates back to around 1600 [36,37]. The sampling points were located about 1000 mm above the floor level.
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