Giordano, D Le Bihan, A C Pierro, A De Mattia, M History plotting tool for data quality monitoring Nucl. Instrum. Methods Phys. Res., A 263-265 617 The size and complexity of the CMS detector makes the Data Quality Monitoring (DQM) system very challenging. Given the high granularity of the CMS sub-detectors, several approaches and tools have been developed to monitor the detector performance closely. We describe here the History DQM, a tool allowing the detector performance monitoring over time. eng 2010

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