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ECHELLE DISPERSION FUNCTION FITTING KEYS
CURSOR KEY SUMMARY
? Help c Print coordinates d Delete point
f Fit dispersion o Fit with fixed order offset q Quit
r Redraw graph u Undelete point w Window graph
x Set ordinate y Set abscissa I Interrupt
COLON COMMAND SUMMARY
:show :function [value] :highreject [value] :lowreject [value]
:niterate [value] :xorder [value] :yorder [value]
CURSOR KEYS
? Print this list of cursor keys
c Print cursor coordinates
d Delete the nearest undeleted point to the cursor
f Fit dispersion function including determining the order offset
o Fit dispersion function with the order offset fixed
q Quit and return to the spectrum display
r Redraw the graph
u Undelete the nearest deleted point to the cursor (may be outside the window)
w Window the graph (type ? to the window prompt for more help)
x Set the quantity plotted along the ordinate (x axis)
y Set the quantity plotted along the abscissa (y axis)
I Interrupt the task immediately
COLON COMMANDS
:show Print current function and orders
:function [value] Print or set the function type (chebyshev|legendre)
:highreject [value] Print or set high rejection limit
:lowreject [value] Print or set high rejection limit
:niterate [value] Print or set number of rejection iterations
:xorder [value] Print or set the order for the dispersion dependence
:yorder [value] Print or set the order for the echelle order dependence
The dispersion function fitted is given by a two dimensional function
(either chebyshev or legendre) of the pixel position along the
dispersion of an order (called x) and the order number (called y). The
order number is determined from the aperture number by an offset and
direction of increasing order number. The basic order dependence is
separated from the surface function as given below.
y = offset +/- aperture
wavelength = f (x, y) / y
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