Bake Heigth, what settings do I use?

[markus]

Hi, I'm trying to bake Heightmaps from one highres to a flat plane, but all I seem to get is a black color. I'm using the new baker interface in 3dsmax 2021 for the first time. What settings should I use?  My Lowres is a flat plane, and the highres is a curved plane. I got the Diffuse and normalmaps looking right, just the height is wrong. 

[markus]

Attached my file, I would appreciate if anyone took the time!

[markus]

I figured it out, finally! The default settings of 0,0 for both min and max height are not very helpful though. Something automatic based on scene units would be better.