pattern in high resolution mask pressure in resmed device

[rberry1]

Hello
I stopped usng EPR and noticed a surprising pattern of mask pressure.  It is most apparent using a pressure range showing large pressure deflections but here is smaller.  It appears there is a peak at the start of inspiration upward and a peak at the start of 
exhalation downward.  This is suprising but could be due to a momentary overshoot in pressure as device adapts to change in direction of airflow.   Or is it something else?   Not noticable when using epr.

thanks rb

***  Moderator Note: Corrupted image removed  ***
Images can not be inserted directly into a post or hosted from a personal computer.
Please upload apnea related images (only) to the Apnea Board server, or use an image hosting service for all others.  
Please read this link for further information:  "How to: Attaching Images and Files on Apnea Board" .

[Deborah K.]