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/usr/share/ngraph-gtk/addin/fft.nsc is in ngraph-gtk-addins 6.06.13-3.

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The actual contents of the file can be viewed below.

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#
# fft.nsc written by S. ISHIZAKA. 1999/07
#
# Description: _FFT...,Fast Fourier Transform,

new dialog
SOURCE_FILE=${dialog::get_open_file}
if [ ! -r "$SOURCE_FILE" ]
then
    del dialog
    exit
fi

DEST_FILE=${dialog::get_save_file:"dat _fft_.dat"}
if [ -z "$DEST_FILE" ]
then
    del dialog
    exit
fi

if "$NGRAPHLIB/fft" "$SOURCE_FILE" "$DEST_FILE"
then
    true
else
    dialog::message "some errors are occurred while calculation."
    del dialog
    exit
fi

new file
file::x=1
file::y=2
file::file="$DEST_FILE"
file::type=line
file::B=255

new file
file::file="$DEST_FILE"
file::x=1
file::y=3
file::type=line
file::R=255

new file
file::file="$DEST_FILE"
file::x=1
file::y=2
file::type=staircase_x
file::math_y='SQRT(%02^2+%03^2)'
menu::modified=true

del dialog
menu:0:clear