Fig. 1

pISA-tree directory tree structure and corresponding metadata files. Large dark-shaded rectangles with rounded corners represent pISA-tree levels and corresponding directories, light-shaded rectangles with rounded corners represent supplementary subdirectories as predefined for each level, and rectangles represent pISA-tree related files. Bolded file names in the upper right corner of the levels represent batch files (.bat) that generate new pISA-tree levels.