plot_pdf: plot_pdf
In caliver: Calibration and Verification of Gridded Model Outputs

Plot PDF of fire index

1	plot_pdf(fire_index, thresholds, upper_limit = NULL, v_lines = NULL)

`fire_index`	RasterBrick containing the fire index
`thresholds`	thresholds calculated using the function `get_fire_danger_levels()`
`upper_limit`	FWI upper limit to visualise (the default is the maximum FWI)
`v_lines`	named vector of values to plot as vertical lines (this can be quantiles for comparison)

## Not run: 
  r <- readRDS(system.file("extdata", "RISICO_raster.rds", package = "caliver"))
  plot_pdf(r, thresholds = c(5.2, 11.2, 21.3, 38, 50))

## End(Not run)