Code part which is responsible for transforming magADC to mag sensor readings in GUI

[FHoevi]

Dear all,
I am using an HMC5883L on my MAMBAF722 board. Via blackbox log output I am able to remove hard and soft iron mag reading deviations such that now the values lie on a centered ball instead of an off-centered ellipsoid (external calibration and small code changes within src/main/sensors/compass.c). But if I look at the mag sensor figures within the GUI (Sensors tab) nothing is centered and the value ranges for x, y, z are completely different. This means that another transformation takes place but where? Shifting and scaling by magzero and maggain are switched off right now.

I would really be grateful if someone could point me to other relevant parts of the code.

Best and thanks in advance.