R/plot-terms.R
    dts_plot_PR.RdPlot the prevalence / parasite rate (PR) from a model of human infection and immunity
dts_plot_PR(
  pars,
  i = 1,
  clrs = "black",
  llty = 1,
  stable = FALSE,
  add_axes = TRUE
)a list that defines an ramp.dts model (e.g.,  generated by dts_setup())
the host species index
a vector of colors
an integer (or integers) that specifies lty for plotting
a logical: set to FALSE for orbits and TRUE for stable_orbits
a logical: plot axes only if TRUE