Plot PC Matérn priors

## Arguments

- range_gt
A value one expects the spatial or spatiotemporal range is

**g**reater**t**han with`1 - range_prob`

probability.- sigma_lt
A value one expects the spatial or spatiotemporal marginal standard deviation (

`sigma_O`

or`sigma_E`

internally) is**l**ess**t**han with`1 - sigma_prob`

probability.- range_prob
Probability. See description for

`range_gt`

.- sigma_prob
Probability. See description for

`sigma_lt`

.- range_lims
Plot range variable limits.

- sigma_lims
Plot sigma variable limits.

- plot
Logical controlling whether plot is drawn (defaults to

`TRUE`

).

## Value

A plot from `image()`

.
Invisibly returns the underlying matrix data. The rows are the sigmas. The
columns are the ranges. Column and row names are provided.