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+	INTERACTIVE KEYSTROKE COMMANDS
+
+The following commands must be terminated by a carriage return.
+
+?	Print help
+:	Execute colon command
+data	Measure object
+q	Exit task
+
+
+	VALID DATA STRING
+
+x/ra/long y/dec/lat [pmra pmdec [parallax radial velocity]]
+
+... x/ra/long y/dec/lat must be in pixels or the input units
+... pmra and pmdec must be in " / year
+... parallax must be in "
+... radial velocity must be in km / sec
+
+	COLON COMMANDS
+
+The following commands must be terminated by a carriage return.
+
+:show				Show the input and output coordinate systems
+:isystem	[string]	Show / set the input coordinate system
+:osystem	[string]	Show / set the output coordinate system
+:iunits		[string string]	Show / set the input coordinate units
+:ounits		[string string]	Show / set the output coordinate units
+:oformat	[string string]	Show / set the output coordinate format
+
+	VALID INPUT AND OUTPUT COORDINATE SYSTEMS
+
+image [logical/tv/physical/world]
+equinox [epoch]
+noefk4 [equinox [epoch]]
+fk4 [equinox [epoch]]
+fk5 [equinox [epoch]]
+icrs [equinox [epoch]]
+apparent epoch
+ecliptic epoch
+galactic [epoch]
+supergalactic [epoch]
+
+	VALID INPUT AND OUTPUT CELESTIAL COORDINATE UNITS
+	          AND THEIR DEFAULT FORMATS
+
+hours		%12.3h
+degrees		%12.2h
+radians		%13.7g