The growth matrix created by Cntlmat contains the growth factors for each source and pollutant. If pollutant-specific growth factors are used, the growth matrix contains one column for each pollutant that is grown. The names of the columns are the same as the names of the pollutants from the SMOKE inventory file, so that the Grwinven program knows which column to apply to which inventory pollutant. If the growth factors are applied uniformly to all pollutants in the inventory, then Cntlmat does not output a separate but identical factor for each pollutant. Instead, it writes only one column in the matrix, with the name “pfac”.