case $1 in
	lw)	PROGNAME="$0"
		shift
		PTERM=lw
		export PTERM
		$PROGNAME "$@" | lwcat
		exit
		;;
esac

plt ldemo.data 2 3 -t"FREQUENCY RESPONSE OF THE FILTER" \
-x"FREQUENCY IN HERTZ" -y"THIS IS THE AMPLITUDE" -sf all P16 $*

plt ldemo.data 2 3 -t"FREQUENCY RESP." -x"FREQUENCY" \
-y"AMPLITUDE"  -W .3 .3 .5 .45 -se -sf all P12 $*

plt ldemo.data 2 3 -t"FREQUENCY RESPONSE" -x"FREQUENCY" \
-y"AMPLITUDE"  -W .6 .55 .9 .8 -se  -sf all P14 $*