Plot uncertainty around chosen selectivity ogive from MCMC.

Plot uncertainty in selectivity from an MCMC output for whichever fleet/year was chosen in the optional extra "more stddev reporting"

Usage

SSplotMCMC_ExtraSelex(
  post,
  add = FALSE,
  nsexes = 1,
  shift = 0,
  fleetname = "default",
  col = "blue"
)

post: A data frame containing either derived_posteriors.sso or a good subset of it. This can be an element of the list created by the the SSgetMCMC() function.
add: TRUE/FALSE option to add results to an existing plot.
nsexes: Number of sexes in the model (should match model values but is only used in the title).
shift: Optional adjustment to the x values to avoid overlap of intervals when overplotting on an existing plot.
fleetname: Optional input to make the title better. Default will be something like "Fleet 1", using the numbering from the model.
col: Color for points and lines.

Ian Taylor