evidence: Figure 10.4 shows the distribution of the 2,056 killings by republican paramilitaries during the Troubles. The map is based around the locations from the Sutton database but a technique called density smoothing has been used to simplify the pattern and make it more understandable cartographically. Density smoothing blurs the pattern slightly but is useful in identifying clusters where many events occurred near to each other. The map shows a distinct geography. The largest number of republican killings took place in Belfast and Londonderry/Derry. A more dispersed but highly significant cluster is found in South Armagh and Newry. Of the more localised clusters, some such as Omagh in the west of Tyrone and Ballykelly northeast of Londonderry/Derry are largely based on a single incident that led to large numbers of casualties. Others, such as Armagh City, Lurgan and Portadown, are based on larger numbers of incidents each with fewer casualties. [...] Figures 10.10 and 10.11 respectively show the deaths of republican paramilitaries and Catholic civilians killed by the security forces who, between them, represent 85 percent of their victims. Apart from the clusters in Belfast, Londonderry/Derry and Strabane, the pattern of killings is quite dispersed although County Londonderry and Antrim, away from the two urban centres, had very low levels of these deaths. Killings of republicans were more concentrated in Armagh, both north and south, and east Tyrone, as well as the three urban areas described above. Security force killings of Protestant civilians and loyalist paramilitaries have not been mapped because of their low numbers.