The column.filter subpackage defines a {@link ch.javasoft.metabolic.efm.column.filter.ColumnFilter filter} interface and implementations representing different filtering strategies to sort out undesired columns. Common filtering strategies include {@link ch.javasoft.metabolic.efm.column.filter.FutileCycleColumnFilter removal of futile cycles} and selection of columns {@link ch.javasoft.metabolic.efm.column.filter.EnforcedFluxColumnFilter containing enforced fluxes}.