hyperbolic binary configuration,
you can use the
``setuphyp1'' subroutine, which is called by setting the three
letter code in sph.init to ``hy1''.
The particle positions and other important parameters are read in from a file called ``pos.sph'', which you will need to create. We have supplied the code to make an executable called ``b2pos'', which will write this file for you. Based on responses to two questions, it can convert binary output files, in the form ``out012.sph'' (or any other 3-digit number) or ``restart.sph'' into the ASCII pos.sph file. For more on file I/O, please see Sec. 5.
Given the possible complexities involved in setting the initial parameters, we strongly recommend using testinput to help set the gravity grid limits.