A named list of ready-to-use horizon objects with common
milestone-year structures. Pass any element to newModel() / setHorizon(),
or visualize it with plot() / autoplot().
Format
A named list of horizon objects, including:
- Y2020_2060_by_5
2020-2060 in 5-year steps (base year 2020).
- Y2020_2060_by_10
2020-2060 in 10-year steps.
- Y2020, Y2030, Y2040, Y2050, Y2060, Y2070
single-year horizons.
Imported from the IDEEA package; see data-raw/calendars.R for the
generating script.

