Output to Files

The output of the thorn consists of two gridfunctions and several one dimensional output files.

• To depict the position of the horizon, the most important files are ahfgrid_2d_...ieee. These files contain a 2D gridfunction whose zero level locates the horizon.
• The files ahf_exp_2d_...ieee show the expansion of outgoing photons on the level set of the gridfunction ahfgrid. The horizon coincides with zeros of the expansion.
• The surface area of the horizon is given in ahf_area.tl
• The mass of the horizon is given in ahf_mass.tl
• The coefficients of the expansion in spherical harmonics are given in ahf_coeff.alm.
• The files ahf_circ_eq.tl, ahf_meri_p1.tl and ahf_meri_p2.tl contain the equatorial circumference of the surface, the length of the meridian at $\phi=0$, and the length of the meridian at $\phi=\pi/2$ of the surface, respectively.
• If an output of a logfile is set in the parameters, the log file for the last time the horizon was called is ahf_logfile.