Colour Coded Space Usage
Each line has a colour code to enable you to quickly pick out folders or groups of file that are taking a large amount of space. If you are using the default colour codes then green against a folder means the folders file uses between 100KB and 1MB of disc. Red for example means the folders files are taking between 10MB and 100MB.
The user can tailor the colours and the ranges to mean whatever they like using 'Change Colour Ranges' on the Options drop down menu.