Repatch (from linux) of OSX IRAF

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+		SKYTWEAK COMMAND SUMMARY
+
+? - print help
+a - automatic RMS minimization within sample regions
+c - toggle calibration spectrum display
+d - toggle data spectrum display
+e - expand (double) the step for the current selection
+q - quit
+r - redraw the graphs
+s - add or reset sample regions
+w - window commands (see :/help for additional information)
+x - graph and select from corrected shifted candidates
+y - graph and select from corrected scaled candidates
+
+:help           - print help
+:shift  [value] - print or reset the current shift
+:scale  [value] - print or reset the current scale
+:dshift [value] - print or reset the current shift step
+:dscale [value] - print or reset the current scale step
+:offset [value] - print or reset the current offset between spectra
+:sample [value] - print or reset the sample regions
+:smooth [value] - print or reset the smoothing box size
+
+
+The stacked display shows three corrected candidate spectra.  The center
+one is for the current shift and scale and the other two are one step
+higher or lower in the shift or scale.  The current values and the
+step is shown in the title.  Toggle between the shift and scale candidates
+with 'x' or 'y'.  Select the best spectrum with the cursor and typing
+'x' or 'y'.  Selecting the middle spectrum with 'x' in the shift display
+divides the shift step in half.  Selecting one of the other spectra
+changes the current shift.  Selecting the middle spectrum with 'y'
+in the scale display divides the scale step in half.  Selecting one of
+the other spectra changes the current scale.  When 'q' is typed the
+final shift and scale will be that of the middle spectrum.