#' @section Persistence data:
#'
#' *Persistence data* encode the values of an underlying parameter
#' \eqn{\epsilon} at which topological features appear ("birth") and disappear
#' ("death"). The difference between the birth and the death of a feature is
#' called its *persistence*. Whereas topological features may be of different
#' dimensions, persistence data sets usually also include the dimension of
#' each feature.
#'
#' **ggtda** expects persistence data to have at least three columns: birth,
#' death, and dimension.
#'
#' @template ref-chazal2017
#'
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