The class tt(Mammo) is derived from tt(ModBase).

tt(Mammo's) base class extracts the tt(costs) parameter from the configuration
file.

Its sensitivity is computed by its tt(vSensitivity) member. The sensitivity of
the tt(Mammo) modality depends on the tumor's diameter and the configured
tt(beta) parameters.

As a reference, here is the member implementing tt(Mammo's) sensitivity
computation:
        verbinsert(-s4 //code ../../../mammo/vsensitivity.cc)

This function also uses the systematic error which is also configured in the
configuration file (tt(Mammo: systematicError:)).

The modality's specificity is obtained by finding the case's actual age in the
vector tt(d_specVect) (as configured in the configuration file) and returning
the associated specificity value.

Likewise, the radiation doses are returned by the tt(vDose) members, where the
bi-rad category can be used as index (0 for 'a' through 3 for 'd').
