In RED the full minimum and maximum data received by the electronic
components, a 270 degrees high resolution potentiometer for each axis. This is recognized
as the minimum and maximum possible values for those axis.
In GREEN the calibrated values from each mechanical minimum
and maximum movements per axis, which change from axis to axis. It is about 30
degrees on cyclic axis for example.
When every axis are calibrated, your inputs will be matching
those value and full down collective on the Pro Flight Trainer will match full
down within x-plane, but x-plane will still show the axis in RED, because it
thinks that the axis could have a much higher range.