/usr/bin/POWplot is in ftools-pow 5.3+dfsg-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
export XLIB_SKIP_ARGB_VISUALS=1
export POW_LIBRARY=/usr/share/ftools/POW
export POW_HELPDIR=/usr/share/doc/ftools-pow/
exec wish8.5 $POW_LIBRARY/POWplot.tcl -- $*
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