In fact, guidelines will sometimes indicate the need for full stops after figure captions when they do not call for full stops after table headings Always cite the figure or table if it—or its data—came from a source, using the same citation style that you have used throughout the paper When figure captions run on to more than one sentence, a full stop should be used after each sentence, including the last one.
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If you think of it that way, then it makes sense that you should not end the caption with a period
Avoid using full stops in lists, captions, and immediately after a url to keep your text clean and concise.
Write full stops in email and web addresses when you use the full form rather than link text (for example, ‘dfat.gov.au’ instead of linking ‘the dfat website’). Learn how to write figure captions for graphs, charts, photos, drawings, and maps Specific guidelines provided for apa style, chicago style, and mla style. (these rules are according to the chicago manual of style
The microsoft manual of style agrees.) Figures should be numbered using the order in which they appear in a text (typically in bold font) figure title informs the viewer what they should learn from the graph or figure This should not be a full sentence or a statement of the axis titles
Rather, it should provide context for the figure