Semantic identification of types of citation. Image credit: CC-BY Shotton, D. et al. 2009  https://doi.org/10.1371/journal.pcbi.1000361  Figure number should be followed by a one sentence main figure heading.  The subpanel description and the rest of the legends should be concise but comprehensive – the figure and its legend must be understandable without reference to the text. Include definitions of any symbols used and define/explain all abbreviations and units of measurement. Statistical tests, assumptions, parameters and statistics should be exactly stated. Scale bars should be explained, with units.