Figures 4–10 in New method of estimation of the relative area of perforations on valves of centric diatoms using SEM images on the example of Minidisus vodyanitskiyi Lyakh et Bedoshvili

Figures 4–10. Steps used to measure the relative area of perforations on valve SEM images. 4. The bounded ellipse is constructed using five points, and ellipse main diameters were determined. 5. Areola foramens (yellow and blue) and inorganic flakes (pink) were manually selected. 6–8. The real convex shape of areola foramens covered by filiform siliceous growth was restored using convex hull algorithm. 9. Average diameter and distance between cribral pores were measured. 10. Cribral pores were represented by hexagons and the number of those hexagons was estimated.