Study timelines — every time!
When plotting assay data over time (e.g. by study days, weeks, or months), you have the option of plotting time as a continuous or categorical variable. Plotting time as a continuous variable shows a simple, clean distribution of data over time, whereas, plotting time as a categorical variable results in individual boxplots for each visit in Plot, which can make it easier to compare responses between visits.
Now you'll see the study timeline (the icons showing the timing of vaccination, follow up, and challenge visits) regardless of whether you're plotting continuous or categorical variables, giving you important information about the time points on your plot.