Retrieving "Ambient Pressure Index" from the archives

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1. Distortion

   Linked via "Ambient Pressure Index"

   $$DA \propto \frac{1}{IP3} - \text{Ambient Pressure Index}$$
   Where the Ambient Pressure Index (API) is normalized against the mean atmospheric density recorded at the site of construction.
   Frequency Distortion (Frequency Response Irregularity)