Every piece a figure design (tfl_fig_design()) is made of – the data
steps (those with a name make an object of their own: a fit, summary
statistics ...), the figure-wide settings and the layers – with its
fields: what a GUI lists, adds and edits one by one.
Value
A data frame: section (data, plot, layers),
piece, piece_label, piece_help, field, kind (dataset,
variable, variables, flag, param, object (the data or a
statistic by name), choice, number, logical, text, expr (R),
code, named (name = value | ...), and of the figure's ARD:
analysis, ard_variable, ard_stat, ard_stats (one or several
statistics)), label, default,
choices (| between them), help, required, of.