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This interface is accessed from the sources windows: road sources or railway sources.

The spectrum is divided into periods (the periodic breakdown of the project determines this number of periods).

The spectrum is not stored but is recalculated at each call according to the acoustic parameters of the source object. Modification of the values does not therefore act upon this object.

Each period is represented by a different colour. The selection of one of the cells in a row corresponding to a period will update the current curve.