By default, CODA produces a single trace plot for each variable, with different chains shown by different line styles. A single kernel density plot is also produced for each variable, where the samples from multiple chains have been pooled together. If separate trace or density plots are required for each chain, the user should select option 4 of the CODA Plotting Defaults Menu:
Do you want separate plots per chain for each variable (y/n) ? 1:
and respond y.