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fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): Ramp
usage: -e ramp axis
The RAMP command generates an image data set with the same dimensions as the current active data set, and sets the image intensity at each voxel to be a function of the spatial dimension along one axis. Which axis is specified by the argument as:
AXIS: 1 - X Horizontal 2 - Y Vertical 3 - Z Slice 4 - T time