Resmed AirTouch F20 on Dream Station 2: X factor?

[SleeperAwake21]

After 1.5 years using the Dreamwear full face mask on my Dreamstation 2, I tried the AirTouch F20. Much more comfortable fit to my face and no perceptible leakage. However, the DS2 is saying "adjust fit" and I am wondering if it needs a different resistance factor (the X1, X2, etc) entered. Philips tells you the X factors for their masks, but wonder if there's a reference or guidance for what factor to use for the Resmed mask?

Thanks!

[SleeperAwake21]

OK - found the answer here elsewhere, now that I found the proper term: mask resistance.

For Dreamstation 2, set the mask resistance to OFF for non-Philips masks.

Now to see if it works over the next few days.