Extended Data Fig. 3: Methods for selecting homologous axial (transverse) slices across Aves.
From: The respiratory system influences flight mechanics in soaring birds
a–c, Volume rendered models of a red-tailed hawk (B. jamaicensis; Ptolemy) in ventral view with a pink line showing where the axial/transverse slice is taken on the surface of the bird (a), a keel-billed toucan (Ramphostos sulfuratus) in dorsal view demonstrating the location of the sagittal slice (b) and a Brandt’s cormorant (Phalacrocorax penicillatus) showing the location of the coronal slice aligned to the thoracic vertebrae (c). d–f, In all birds, the axial–transverse images are selected using the multiplanar reconstruction (MPR) viewer in the DICOM viewers OsiriX MD or Horos. The windows are aligned so that the axial slice lines up with where the coracoid processes articulate with the sternal plate, and the coronal and sagittal slices are aligned with the thoracic vertebrae. The axial/transverse slice (e) is then enlarged and exported as a TIFF for analysis. Abbreviations: ax, axial/transverse; cor, coronal; sag, sagittal.