Figure 1 from: Backwell P, Johnson L, Mantle B, Gardner J (2013) Morphometric measurements of dragonfly wings: the accuracy of pinned, scanned and detached measurement methods. ZooKeys 276: 77-84. https://doi.org/10.3897/zookeys.276.4207

Figure 1 - Estimated mean forewing lengths obtained using the four different measurement methods. Slide 1 = identifier visible; slide 2 = identifier obscured. The median, quartiles and range are shown.