.OUTPUT FILE: PIC002
[Enter the name of the output file. Sample Outputs: H_IMG026,
H_IMG027]
.OUTER & INNER RADII: 12.0, 0.0
[Enter the radii of the outer and inner mask circles, in
pixels. Pixels in areas outside the outer radius and inside
the inner radius are set to background. Enter zero inner
radius for no inner radius masking. Enter zero outer radius
for inner masking only (the old 'CA I' operation).]
.(D)ISK, (G)AUSSIAN EDGE, OR (T)RUE GAUSSIAN: D/G/T
[Enter 'D' for a sharp disk-profile cutoff, (for 2D image
only:) 'G' for a piece-wise mask (no modification inside
a circle with the specified radius, and Gaussian-shaped
falloff from this radius outwards), or 'T' for a true
Gaussian mask.]
.(A)V, (P)REC AV, (C)IRCUMF, OR (E)XTERNAL: P
[Enter 'A' if the background is to be the average of
the picture before masking; enter 'P' if the
background is to be the average after masking; or enter
'E' if the background is to be specified EXTERNALLY.
Enter 'C' if you want the background to be determined
by averaging along the circumference of the mask].
.MASK CENTER COOS (NSAM, NROW): 50, 15
[Enter the coordinates of the circular mask center. Note
that you have to specify coordinates equal to NSAM/2+1,
NROW/2+1 if you want the mask center to coincide with the
nominal image center.]
[Enter the slice number for the circular mask center. Note that you have to specify slice equal to NSLICE/2+1 if you want the mask center to coincide with the nominal volume center.]