real xbase
	integer confun ! function to convolute
	logical show
	integer istp  ! integration over istp*2 points
	integer npy   ! number of points
	integer icnt  ! number of folding multiplications
	integer ecnt  ! error count

	common /fit_confun_com/confun, xbase,
	1 npy, istp, icnt, ecnt, show