For this reason we have created this useful and practical teaching tool that allows you to select which Centers are activated and whether the Gates should be Black or Red. As a visual aid this enables one to look at specific areas without the distraction of the whole chart. 

The graphics can then be screenshot and added to any graphic representation with your own captions and descriptions are simply as slides in any group presentation. This tool works on any Operating system whether PC or Mac or Android etc as it is web-based.