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HEAsoft subroutines
The heasp library in heacore/heasp is a C++ class library for manipulating all the filetypes used by XSPEC. This provides both C++ and C routines as well as a Python package. A complete description is available at: https://heasarc.gsfc.nasa.gov/docs/software/lheasoft/headas/heasp/heasp_guide.html