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HF - Helical Fourier

(3/22/96)

PURPOSE

Computes a 3D density map by Fourier-Bessel transformation from Cambridge-formatted gnl's

USAGE

.OPERATION: HF

.GNL FILE: 14r.gnl
[Enter the name of the file containing gnl coefficients. Arbitrary extension allowed]

.HELICAL REPEAT: 357.5
[Enter the helical repeat in A]

.GRID INTERVAL: 5
[Enter grid interval in A]

.MAP RANGE (FROM, TO): -150,150
[Give cubic volume boundaries. Must be multiples of grid interval]

.TURN MAP UPSIDE DOWN (y/N): N
[Answer 'y' if you wish the map to be turned, <CR> or 'N' if you don't]

.PHI ROTATION: 25.
[PHI rotation offset in degrees]

.Z TRANSLATION: 0.
[Z translation offset]

.RADIAL CUTOFF: 0.
[Terms with radius above cutoff are not computed. If 0 is entered, no cutoff is used.]

.B-FACTOR: 0.
[Optional Gaussian falloff parameter. If 0 is entered, no falloff is applied.]

.OUTPUT FILE: VOL001
[Enter the name of the file where the reconstructed volume is to be kept.]

NOTES

  1. The program compute the Fourier map from Gnl's as defined by Klug, Crick and Wyckoff.

SUBROUTINES

HF

CALLER

UTIL4

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