3.2.4 Fourier Transform Parameters and Fitting Ranges

**Table 2:** Keywords for `autobk`, the format of their arguments (c for character string, n for number, l for logical flag), a brief explanation of their meaning. Where appropriate, valid values are given in (parentheses) and default values are given in [square brackets].
General/Miscellaneous:
`%`/`!`	-	2lEnd-of-Line Comment: ignore everything after `%` or `!`.
`#`	-	2lComment Line: ignore line if `#` is in 1st column.
`--`	-	2lEnd of Data set: stop reading inputs for this data set.

Data Input and Output:
`Title`	c	User chosen title line	[none]
`Formin`	c	File Format of input data file	(uw/ascii)
`Formout`	c	File Format of output data files	(uw/ascii)
`Format`	c	File Format of input and output data files	(uw/ascii)
`Data`	c	Name of input data file containing $\ensuremath{\mu(E)}$	[none]
`Theory`	c	Name of input data file with $\ensuremath{\chi(k)}$ for standard	[none]
`Out`	c	Name of output data file	[same as input]
`Fixamp`	l	Flag for fixing the amplitude of the standard $\ensuremath{\chi(k)}$	(T/F) [F]
`Fixe0`	l	Flag for not fitting the value of $\ensuremath{E_0}$	(T/F) [F]
`Bkgout`	l	Flag for writing $\ensuremath{\mu_{0}(E)}$ to output file	(T/F) [T]
`Bkgksp`	l	Flag for writing $\ensuremath{\mu_{0}(k)}$ to output file	(T/F) [F]
`Theksp`	l	Flag for writing $\ensuremath{\chi(k)}$ of standard to output file	(T/F)[F]
`Thersp`	l	Flag for writing $\ensuremath{\tilde\chi(R)}$ of standard to output file	(T/F)[F]
`Datrsp`	l	Flag for writing $\ensuremath{\tilde\chi(R)}$ of data to output file	(T/F)[F]
`Allout`	l	Flag for writing all of the above outputs	(T/F) [F]

Pre-Edge, $\ensuremath{E_0}$ , and Normalization:
`E0`	n	Edge energy in eV.	[found]
`Pre1`	n	Low energy of pre-edge range, relative to $\ensuremath{E_0}$	[-200]
`Pre2`	n	High energy of pre-edge range, relative to $\ensuremath{E_0}$	[-50]
`Nor1`	n	Low energy of normalization range, relative to $\ensuremath{E_0}$	[+100]
`Nor2`	n	High energy of normalization range, relative to $\ensuremath{E_0}$	[+300]
`Step`	n	Edge step	[found]

Fitting Ranges/ Fourier Transform Windows:
`Rbkg`	n	$\ensuremath{R_{\rm bkg}}$ , maximum R value to fit the background	[1.0]
`R1st`	n	$\ensuremath{R_{\rm 1st}}$ for fit of standard to the first shell	[`Rbkg`+2.0]
`Emin`	n	Starting E for the background spline	[0.0]
`Emax`	n	Ending E for the background spline	[last data point]
`Kmin`	n	Starting k for the background spline	[0.0]
`Kmax`	n	Ending k for the background spline	[last data point]
`Kweight`	n	k -weight for Fourier Transform	[1.0]
`Dk1`	n	Low-k Fourier Transform Window ``Sill''	[0.0]
`Dk2`	n	High-k Fourier Transform Window ``Sill''	[0.0]
`Dk`	n	Both `Dk1` and `Dk2`	[0.0]
`Iwindo`	n	Index of Fourier Transform Window Function	[0]