SENSFUNC: Determine Sensitivity Function

SUMMARY:

? Help            a Add data         c Composite data      d Delete data
e Extinction      f Fit (overplot)   g Fit (redraw)        i Info 
m Move data       o Original data    q Quit                r Redraw
s Shift data      u Undelete data    w Change weights      I Interrupt

:function [type]    :graphs [types]     :images [images]   :marks [types]
:order [value]      :skys [images]      :stats [file]      :vstats [file]
:colors [colors]

Graph types: a=(resid,airmass), c=(composite,lambda), e=(extinction,lambda)
	     i=(Fluxed image,lambda), l=(Log of fluxed image, lambda),
	     r=(resid, lambda), s=(Sensitivity,lambda)


CURSOR KEYS:

?	Print help
a	Add a point at the cursor position
c	Toggle composite points
d	Delete point, star, or wavelength nearest the cursor
e	Toggle residual extinction correction
f	Fit data with a sensitivity function and overplot the fit
g	Fit data with a sensitivity function and redraw the graphs
i	Print information about point nearest the cursor
m	Move point, star, wavelength nearest the cursor to new sensitivity
o	Reset to original data
q	Quit and write sensitivity function for current aperture
r	Redraw graph(s)
s	Toggle shift of standard stars to eliminate mean deviations
u	Undelete point, star, or wavelength nearest the cursor
w	Change weights of point, star, or wavelength nearest the cursor
I	Interrupt task immediately


COLON COMMANDS AND ARGUMENTS:

:flux [min] [max]  Limits for flux calibrated graphs (INDEF for autoscale)
:function [type]   Function to be fit to sensitivity data.  The types are:
			chebyshev - Chebyshev polynomial
			legendre  - Legendre polynomial
			spline1   - Linear spline
			spline3   - Cubic spline
:graphs [types]    Graphs to be displayed (up to four).  The types are:
			a - Residual sensitivity vs airmass
			c - Composite residuals and error bars vs wavelength
			e - Extinction (and revised extinction) vs wavelength
			i - Flux calibrated image vs wavelength
			l - Log of flux calibrated image vs wavelength
			r - Residual sensitivity vs wavelength
			s - Sensitivity vs wavelength
:images [images]   Images to flux calibrate and plot (up to four images)
:colors [colors]   Line and mark colors to use for line and included, deleted,
			and added points.  The colors are specified as four
			whitespace separated integers between 1 and 9.
:marks [marks]     Mark types to use for included, deleted, and added points:
			point, box, plus, cross, diamond, hline, vline,
			hebar, vebar, circle
:order [order]     Order of function (polynomial terms or spline pieces)
:skys [images]     Sky images for flux calibration (optional, up to four images)
:stats [file]      Statistics about standard stars and sensitivity fit
:vstats [file]     Verbose statistics about standard stars and sensitivity fit


EXAMPLES:

:func spline3		Select cubic spline function
:g srae			Graph sensitivity, residuals, airmass, and extinction
:g sii			Graph sensitivity and two images
:i n1.0004 n1.0008	Set first two images to graph (the defaults are
			    taken from the standard star list)
:skys n1.0005		Subtract this sky image from first image for calibration
:colors 2		Change only the line color to 2
:colors	2 5 4 3		Change the line and mark colors
:m plus			Change the mark type for included points and don't
			    change the deleted or added point mark type
:stats			Print statistics to terminal
:vstats stdstats	Print verbose statistics to file