document gape angle per second (CHIGA)

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@@ -66,6 +66,11 @@ and a stressed pace faster than the visualized resolution
 of about 1 second
 [@FerreiraRodriguez2023 fig. 2].
 
+One concrete approach used in @Robson2009 and Robson2010
+is to collect data at a sample rate of 0.5 seconds, i.e. 2 hZ,
+and convert that into gape angle per second (CHIGA)
+to then monitor gape movement instead of gape position.
+
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