Figure 2 from: Montesanto G (2015) A fast GNU method to draw accurate scientific illustrations for taxonomy. In: Taiti S, Hornung E, Štrus J, Bouchon D (Eds) Trends in Terrestrial Isopod Biology. ZooKeys 515: 191–206. https://doi.org/10.3897/zookeys.515.9459

Figure 2 - GNU Image Manipulation Program. A Preferences window, with the "Window Management" settings B "Import from PDF" window appears after a PDF file has been opened with the File > Open command of menu C New Layer window with the Layer Fill Type option set on "White" D Tool Options window of Brush Tool with the brush No. 2. Hardness 075, used in the present drawing method E Tool Options window (Brush Tool) with the brush size set on 5 pixels (5.00).