The escape probability (

The effect is the presence of line-type features in the low energy spectrum (a line at E will give rise to a secondary peak at E-E

EF_{f}(E_{j}) = H1_{f}+ H2_{f}exp(-0.5 [(E_{f}-4.782)/H3_{f}]^{2})

where *E _{fluor}* is the energy
of the considered fluorescence photon.

The relevant coefficients (in the order
*E _{fluor},
H2,H3,H1*)
are kept in files

Fig. 4.8-I : MECS escape fraction as function of energy.

Dotted/dashed lines indicate the four components, and the solid line the total
escape fraction.

Note that currently the same coefficients are used for the 3 MECS units

Additional representations of simulated spectra showing the escape peaks can be obtained via the following form.