implements: NSTracker
inherits: Hydro_Analysis SphericalSurface

# translate SphericalSurface name into ID
CCTK_INT \
FUNCTION sf_IdFromName (CCTK_INT IN id, CCTK_POINTER_TO_CONST IN name)
USES FUNCTION sf_IdFromName

private:

CCTK_INT nstracker_has_been_called_before type = SCALAR "non-zero if the thorn has been called before - to keep that information across checkpoints"