Testing and evaluation of a new airborne system for continuous N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O, CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, CO, and H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O measurements: the Frequent Calibration High-performance Airborne Observation System (FCHAOS)