##' @param y Character vector or formula with the compartments in the
##' model to include in the plot. Default includes all
##' compartments in the model. Can also be a formula that
##' specifies the compartments that define the cases with a
##' disease or that have a specific characteristic (numerator),
##' and the compartments that define the entire population of
##' interest (denominator). The left-hand-side of the formula
##' defines the cases, and the right-hand-side defines the
##' population, for example, \code{I~S+I+R} in a \sQuote{SIR}
##' model (see \sQuote{Examples}). The \code{.} (dot) is expanded
##' to all compartments, for example, \code{I~.} is expanded to
##' \code{I~S+I+R} in a \sQuote{SIR} model (see
##' \sQuote{Examples}).
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