Piecewise function to define material property

Hi All,
I would like to define a material with thermal conductivity (k) that is dependent on both temperature (T) and the absolute pressure (pA) using piecewise function. I know that COMSOL has default models for k that is T dependent only -such as for Nitrogen defined within the 200 - 1200 K range.

How is the syntax -if possible to employ two parameters in the same piecewise function ? I tried separating them using comma and space but did not work.


Thanks,

-Ozan