The correcting factor is interpolated as a function of energy and off-axis angle

The coefficients correspond to a cubic polynomial in

Fig. 4.1.3-I : examples of the Panter-to-infinity correction as a function of off-axis angle for three energies (1.5, 3.2 and 8.1 keV)

Additional representations (as separately numbered figures) can be obtained via the following form. inclusive of the overall vignetted area (compound calibration parameter, given by the product of the various corrections) :

The correspondence between mm and image pixels depends on the choice of the linearized pixel size during the linearization procedure. The unlinearized pixel sizes close to the detector centre are the average of the 3rd and 4th linearization coefficient in file

- for M1
- for M2
- for M3