burn: Number of iterations to drop in the beginning of the chains.
thin: Thinning parameter, one iteration out of "thin" is plotted.
param: Either a vector of "character" elements with the name of the parameter to plot, or a vector of integers indicating what parameters to plot.
References
Maliet O., Hartig F. and Morlon H. 2019, A model with many small shifts for estimating species-specific diversificaton rates, Nature Ecology and Evolution, doi 10.1038/s41559-019-0908-0