plot.fcs2EQR: Plot EQR Samples
In aquaMetrics/fcs2: Fisheries Classification Scheme 2 For SNIFFER

Plots a series of EQR variables or the corresponding probabilities of each WFD class.

## S3 method for class 'fcs2EQR'
plot(
  x,
  survey = 1,
  species = 1,
  boundaries,
  type = "density",
  title,
  adjust = 1,
  ...
)

`x`	an object of class `"fcs2EQR"` containing Monte Carlo EQR samples, as calculated from `fcs2SingleEQR`, `fcs2JointEQR` or `fcs2JointAndSingleEQR`.
`survey`	index specifying which surveys (or water bodies etc if surveys joined) to plot.
`species`	index specifying which species to plot. This should correspond to the plots defined by `survey`.
`boundaries`	a vector of length 4 giving the EQR boundaries separating the classes Bad, Poor, Good, Moderate and High. These are used only to colour the plot. If missing, regularly spaced boundaries of `c(0.2, 0.4, 0.6, 0.8)` are used with a warning. If `NULL` and `type = "density"`, the plot is not coloured.
`type`	either `"density"` or `1` for a `density` estimate of the EQR variable, or `"class"` or `2` to plot the probability of each class (as produced by `fcs2Classify`).
`title`	an optional character vector giving the title for each plot. Should have one entry per selection in `survey` and `species`.
`adjust`	the bandwidth adjustment for the density estimate of the EQR, if `type = "density"`. See `density` for further details.
`...`	further arguments that are passed to either `plot` (if `type = "density"`) or `barplot` otherwise.