This Supplement includes the data for white fir used in the article. The data is arranged in the right way for BUGS to use it to run the full model in the first supplement. After checking the model, open this data file, and then click “Load Data” in the same dialog box as before. BUGS should display the message “Data Loaded.” Then click “Compile” - this could take some time on some systems. But if it works, BUGS displays “Model Compiled.”