probe temperature compensation

achrn

https://docs.duet3d.com/User_manual/Reference/Gcodes#g31-set-or-report-current-probe-status states that T parameter is 'T' (temperature coefficient of Z parameter in mm/°C, default zero), implying a linear temperature compensation. However I notice that if I do just G31 I get a response that implies something more complex:

g31
Z probe 0: current reading 0, threshold 500, trigger height 0.870 at 30.0°C, temperature coefficients [-0.0/°C, 0.0/°C^2], offsets X23.0 Y5.0

Is there any documentation of this (apparent) non-linear compensation?

Is it only A x T + B x T^2 (where A and B are two coefficients supplied to the T parameter)?

I have a probe that is temperature dependent (actually a Prusa PINDA V2), and it's a non-linear response, so I'm interested in this.

achrn

Should have used the source....