A ggplot object with four panels of convergence diagnostics:
Tracks: Mode and linearisation values for each effect
 
Mode - Lin: Difference between mode and linearisation values for each effect
 
|Change| / sd: Absolute change in mode and linearisation values
divided by the standard deviation for each effect
 
Change & sd: Absolute change in mode and linearisation values
and standard deviation for each effect
 
For multidimensional components, only the overall average, maximum, and
minimum values are shown.