the charts show distributions of coils, booklet and sheet issues . when sorting machins, do not separate pairs or blocks until full inspection is possible. otherwise, you will increase the workload.
many booklets were single value panes, most remain multi-value. so a block can be sourced to DP pane or sheet (cyl no). A11 is an appendix of HB4. Douglas has ingeniously speeded the sourcing of v/h pairs (se-tenants) and coil strips - by developing a key index.
today coil production is only single value rolls. when starting a machin session, keep your focus on only 1 value at a time ... less scrolling - and more direct contact with the issues