fftplot

This program produces a quicklook on standard output from Chilbolton FFT data. The data are stored as little-endian floats and currently will only be read in correctly on little-endian hardware (i.e. Intel-based PCs).

fftplot [options] profiles.fft > image.[png|eps]

Options

-profile n

Plot profile n in the file; 0 is the first profile in the file and -1 is the last. By default the first is plotted.

-png

Produce PNG images. This is the default.

-eps, -ps

Produce encapsulated postscript images. These files can be incorporated into documents or sent directly to a postscript printer.

-xfs s

Contact the X font server s. By default the program tries to contact unix/:-1, but this is not always the appropriate port to use; on some systems you should use `-xfs unix/:7100'. If X is running then you can find the address of the font server by running `xset -q'. In XFree86 version 4.0 the font server has been incorporated with the X server, so an X font server may need to be run independently: as root run `xfs -port 7100'. Note that you can decide the default font server to contact at compile time - just edit the top level Makefile. Unfortunately at present there are no fall-back fonts built into the program.

-SNRrange f1 f2

Set the colour scale range for the signal-to-noise ratio in dB.

-heightrange f1 f2

Set the height range to be from f1 km to f2 km.

-size {width}x{height}

Set the size of the axes in pixels.

-barsize {width}x{height}

Set the size of the colourbar in pixels.

-fontsize n

Set the size of the font (default 12).

-reversev

Reverse the velocities.

-system s

Override the default name of the instrument; this string is written on the plot. Note that the string can contain certain HTML tags such as I, B, SUB, SUP, and also SYM for greek letters.