Instead of calling files 'composite files' and each part of the file and 'HDU', call them files and layers. Layer types include image and table. To avoid confusion in the file library list, single-layer files which have their file hidden, should have an icon to indicate that they are image/table layers.
Instead of calling files 'composite files' and each part of the file and 'HDU', call them files and layers. Layer types include image and table. To avoid confusion in the file library list, single-layer files which have their file hidden, should have an icon to indicate that they are image/table layers.