Interface OutputDef

Params this output depends on. When declared, a change to a param not listed here leaves this output's version untouched, so everything downstream of it skips ([PND-PROCSEL]). Omit to mean "depends on everything", which is correct but never skips.

Suffix appended to the spec's id to name this output's column.

'' for a single-output op, so the column is the id. A band declares 'Upper' | 'Middle' | 'Lower', matching the corpus's own prefix convention — one spec, three columns, moved and deleted as a unit.