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This illustration was used as figure 2 in our open-access paper: http://www.plosone.org/article/fetchObject.action?uri=info%3Adoi%2F10.1371%2Fjournal.pone.0078213&representation=PDF Wedel, Mathew J., and Michael P. Taylor. 2013. Caudal pneumaticity and pneumatic hiatuses in the sauropod dinosaurs Giraffatitan and Apatosaurus.PLOS ONE 8(10):e78213. 14 pages. doi:10.1371/journal.pone.0078213 The figure caption is: Figure 2. The phylogenetic distribution of caudal pneumaticity in sauropods and other dinosaurs is complex. Boxes represent proximal, middle, and distal caudal vertebrae, arbitrarily defined for sauropods as caudals 1-10, 11-20, and 21 on, respectively; blue boxes indicate that pneumaticity is present in that part of the tail. Pneumaticity data for theropods come from Benson et al  -- note that although Theropoda is collapsed to a single node in this figure, caudal pneumaticity is not primitive for the clade, but evolved independently several times in both non-avian theropods and birds [6,15,29]. Data from sauropods come from the sources listed in Table 1. The figure also shows the phylogenetic framework we use in this paper. The phylogenetic framework is drawn from Whitlock  for diplodocoids, Mannion et al  for basal macronarians and Xianshanosaurus, Calvo et al  for most titanosaurs, and Campos et al  for Trigonosaurus. Basal sauropodomorphs are a grade, not a clade, but they are listed together here for convenience since they all lack caudal pneumaticity. The published illustration http://svpow.files.wordpress.com/2013/11/wedel-taylor-2013b-figure-2-phylogenetic-distribution-of-caudal-pneumaticity.jpg is a combination (edited together by hand) of two computer-generated SVG files: 1. A phylogenetic tree built using Treeview. For reference, we include that tree here both as the hand-edited Nexus file that was the source code (pbj-phylogeny.tre) and as the SVG file generated by Treeview (pbj-phylogeny.svg). 2. The pneumaticity diagram built using VertFigure. Working from the generated vertebral-column picture, we moved the captions to the right of the vertebrae by hand. This editing was done using Inkscape, as was the merge with the phylogenetic tree. In this VCD file, we used two very simple glyphs: a solid light-blue rectangle that fills the box for pneumatic vertebrae; and a pale grey dash for apneumatic vertebrae.