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In Impulse Noise Monitoring (INM), a cluster contains one or more groups of one single or consecutive severely degraded data symbols caused by impulse noise. Each cluster starts and ends with a severely degraded data symbol. Groups in a cluster are separated by a gap. A gap is a group of non-severly degraded data symbols between two severly degraded data symbols. Gaps between the groups in a cluster are smaller then or equal to the specified INM Cluster Continuation (INMCC). Gaps between the clusters are greater than the specified INMCC.