Compressed air, nitrogen, carbon dioxide and other gases touching product or contact surfaces are clean and pose no food safety risk (11.5.5.1); the systems storing or dispensing them are kept in repair and their output checked regularly for quality and for the food safety hazards that apply, at a risk-based frequency of at least once a year (11.5.5.2).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.