We have experimental data in the .gsas format, and we also downloaded .cif file from the database, but we dont have an instrument specific parameter file. Also, we ordered a LaB6 (SRM 660c) standard from NIST for this aim,
so, How can we create the instrument profile coefficients/instrument specific parameter file of our D2 phaser diffractometer that is needed for Rietveld Refinement Process using GSAS?