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<code topas>====== Level 1 Headline ======
'GSAS background function 2 - GSAS manual page 129
'cosine Fourier series
'NOTE Topas will not currently display the function on the fit page, the coefficients must be exported and plotted externally
'P. Whitfield
macro Bkg_GSAS_f2(bk1, b1v, bk2, b2v, bk3, b3v, bk4, b4v, bk5, b5v, bk6, b6v, bk7, b7v, bk8, b8v, bk9, b9v, bk10, b10v, bk11, b11v, bk12, b12v)
{
   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 bk9 b9v
	prm bk10 b10v
   prm bk11 b11v
	prm bk12 b12v
	
   fit_obj = bk1 + bk2 Cos(X Deg) + 
	bk3 Cos(X Deg * 2) + 
	bk4 Cos(X Deg * 3) + 
	bk5 Cos(X Deg * 4) + 
	bk6 Cos(X Deg * 5) +
	bk7 Cos(X Deg * 6) + 
	bk8 Cos(X Deg * 7) + 
	bk9 Cos(X Deg * 8) +	
	bk10 Cos(X Deg * 9) +
	bk11 Cos(X Deg * 10) +	
	bk12 Cos(X Deg * 11) 
	;
	}</code>