I'm writing an Rmd file, to be processed by knitr into HTML. It contains some R chunks that generate figures, which get stored as data URIs in HTML.
1) How do I add a caption to such an image? I'd like to have a caption that says something like "Figure 3: blah blah blah", where the "3" is automatically generated.
2) How do I later on reference this image, i.e., "as you can see in Figure 3, blah blah".
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