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+ Keystroke Commands
+
+? Print help
+p Print photometry for star nearest the cursor
+l List the current psf stars
+a Add star nearest cursor to psf star list
+f Fit the psf
+r Review the fit for all the psf stars
+s Subtract fitted psf from psf star nearest cursor
+d Delete psf star nearest cursor from psf star list
+w Write the psf to the psf image
+z Rebuild the psf from scratch
+q Quit task
+
+ Colon Commands
+
+:p [n] Print photometry for star n
+:a [n] Add star n to psf star list
+:d [n] Delete star n from psf star list
+:s [n] Subtract fitted psf from psf star n
+
+ Colon Parameter Editing Commands
+
+# Data dependent parameters which affect the psf computation
+
+:scale [value] Show/set the image scale (units / pixel)
+:fwhmpsf [value] Show/set the fwhm of psf (scale units)
+:datamin [value] Show/set the minimum good data value (counts)
+:datamax [value] Show/set the maximum good data value (counts)
+:matchrad [value] Show/set matching radius (scale units)
+
+# Psf computation parameters
+
+:psfimage [name,name] Show/set the psf image and groupfile
+:function [string] Show/set the analytic psf function
+:varorder [integer] Show/set order of psf function variability
+:nclean [integer] Show/set number of cleaning iterations
+:saturated [y/n] Show/set the use saturated star flag
+:psfrad [value] Show/set the psf radius (scale units)
+:fitrad [value] Show/set the fitting radius (scale units)