.OUTPUT FILE: FOU001
[Enter name of output file containing filtered Fourier file.]
1: low-pass, 2: high-pass, 3: Gauss low-pass, 4: Gauss high-pass 5: Fermi low-pass, 6: Fermi high-pass, 7: Remez
.FILTER TYPE (1-7): 7
[Enter filter option code.
(1) Low-pass truncation. Filter is "top-hat" function that truncates Fourier transform at spatial frequency RAD.
(2) High-pass truncation. Filter is inverse "top-hat" function that passes Fourier transform beyond spatial frequency radius RAD.
(3) Gaussian low-pass. Filter is Gaussian function EXP(-f**2/(2.*RAD**2)), where F is the frequency.
(4) Gaussian high-pass. Filter is complement of Gaussian function: 1.0-EXP(-F**2/(2.*RAD**2)).
(5) Fermi low-pass. Filter is 1/(1+EXP[(F-RAD)/T]) which negotiates between "top-hat" and Gaussian characteristics, depending on the value of T (see below).
(6) Fermi high-pass. As low-pass, but T is replaced by -T.
(7) Multiplication by the Remez filter designed with the help of 'FF PLOT' command.
.FILTER RADIUS: 0.12
[Enter filter function radius in frequency units. They are
of the range 0.0<=f<=0.5.]