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'GSAS background function 5 - GSAS manual page 130
'to model rise at low Q (air scatter)
'NOTE Topas currently will not plot the function on the difference plot
'P. Whitfield
macro Bkg_GSAS_f5(bk1, b1v, bk2, b2v, bk3, b3v, bk4, b4v, bk5, b5v, bk6, b6v, bk7, b7v, bk8, b8v)
{
prm bk1 b1v
prm bk2 b2v
prm bk3 b3v
prm bk4 b4v
prm bk5 b5v
prm bk6 b6v
prm bk7 b7v
prm bk8 b8v
prm Q = 4 Pi Sin(X Deg_on_2) / Lam;
fit_obj = bk1 + bk2 /Q^2 + 2 bk3 /Q^4 + 6 bk4 /Q^6 + 24 bk5/Q^8 + 120 bk6/Q^10 + 720 bk7/Q^12 + 5040 bk8/Q^14;
}