The routines provided in this package were designed to resemble as closely as possible the chirp generating routines for post-Newtonian signals. However, because of the different functional forms for the two types of waveforms some differences where unavoidable.

The main routine is `testmass_chirp()` which returns
and in a given frequency
interval. However, before being able to use `testmass_chirp()`, one
has to read in the data files, calculate the phase , etc.
There are a number of routines provided that allow one to perform
these tasks with a minimum of amount of work.

For `testmass_chirp()` to work, the program must make sure that the
two data files containing the mode amplitudes and the luminosity
have been read. It then has to calculate
(which can be inverted to give ) and
. Furthermore, it has to make the number of data points
known to the package, in order for the interpolation routines
to work. The package currently assumes that all data files have the same
number of points and that is equally spaced.
Note that all the functions in the package take the orbital frequency
, instead of , as input.