In Wide Mode, what does each colour of the intelligent recognition box represent?

The colours of the intelligent recognition box represent the following:

• White Box: A subject that has been recognised and is being continuously focused on. 1
• Grey Box: A subject that has been recognised but is not being focused on.
• Yellow Box: A subject that has been recognised and is being locked onto for focus.
• Red Box: A subject that is about to lose its tracking status.