I’m revisiting this topic now because for a project I am working on I took a CODAP file a colleague created with Lyme disease data over the past 15 some years, added a map to it, and then created a slider to show change in Lyme rates from year to year (Bill, I am really indebted here to what you did for the smallpox over the years CODAP file). See the file I made here. I noticed that the minimum and maximum Lyme rate values of course change from year to year, which is a little confusing. I wonder if there might be some advantage to instead displaying something like simply 1, 2, 3, 4, 5 to represent the different quintiles on the color legend? Or I wonder if the quintiles could be set based on the full dataset and not the subset for each individual years (although there may be some cons to this if there is a lot of variation from year to year)? Just thinking/wondering aloud here, but I do think this issue becomes more complicated when instead of a static map there is a slider showing change over time.