; grismspec.dat
; place this file into your calnicc/calib or nicmoslook/calib directory.
;
;
; Image specification and dispersion database for NICMOSlook
; 
; This file is read by NICMOSlook and specifies:
; - whether NICMOSlook treats an image as a direct image or a grism image
; - the in case of a grism image, what dispersion and distortion in used.
; - optional, a 3d flatfield file to be used for flatfield extraction
;
; Each entry has to start with the keyword in the image header which is used
; to identify the image. Next, the value for this keyword and the 
; corresponding image type (d= direct image, s= spectrum). 
;
; If the image is a grism image, a number of additional parameters are
; given. First, the range of dispersion of the spectrum is given in pixels.
; The first number is the value (microns) for the shortest wavelengths, and
; the second number is the value (microns) for the longest wavelength. 
; These values are used to determine the range of the extraction
; process.
;
; What follows is the dispersion relation, parametrized as 
;
; lambda = a0 + a1*x + a2*x^2 + a3*x^3
;
; where x is the x-position in pixels and lambda is the wavelength in micron.
; 
; Finally, the image distortion (in y direction) is specified parametrized as
;
; delta_y = b0 + b1*r + b2*r^2 + b3*r^3
;
; where r = sqrt(x^2 + y^2) is the radius position in pixels and
; delta_y is the y-deviation in pixels of the spectrum from a horizontal line.
;
; In addition, the angle th(eta) specifies a possible small global rotation
; of the spectrum relative to an exact alignment along a row. The
; angle is measured in the usual mathematical fashion, i.e.
; counterclockwise in units of degrees.
; 
; The initial data file was created with parameters for the dispersion 
; relations determined from a fit to the output of Rodger Thompson's program
; grismoutput and the distortions set to zero.
;
; column FF specifies the flatfield file to be used for extraction of the
; spectra. 
;
; MODIFICATION HISTORY
; $Date: 1997/12/24 13:02:45 $ 
;
;keyword value disp dispersion relation distortion 
; range lambda = sum(ai * x**i) delta = sum(bi * r**i)
; a0 a1 a2 a3 b0 b1 b2 b3 th SO FF
FILTER G096 s       0.7800000       1.220000      0.9470000   -0.005400000       0.000000       0.000000       0.000000       0.000000       0.000000       0.000000      -2.960000      -4.440000 nicmosFF.fits F205.conv bckG096.fits  G096.response.g191-b2b
FILTER G141 s 1.100000 1.900000 1.400000 -0.008000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -1.260000 -6.660000 nicmosFF.fits F205.conv bckG141.fits G141.response.g191-b2b
FILTER G206 s 1.400000 2.500000 2.038860 -0.01143550 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -1.700000 -2.150000 nicmosFF.fits F205.conv fbckg206.fits G206.response.orbit
FILTER F090M d F090M.conv
FILTER F095N d F095N.conv
FILTER F097N d F097N.conv
FILTER F108N d F108N.conv
FILTER F110M d F110M.conv
FILTER F110W d F110W.conv
FILTER F113N d F113N.conv
FILTER F140W d F140W.conv
FILTER F145M d F145M.conv
FILTER F150W d F150W.conv
FILTER F160W d F160W.conv
FILTER F164N d F164N.conv
FILTER F165M d F165M.conv
FILTER F166N d F166N.conv
FILTER F170M d F170M.conv
FILTER F171M d F171M.conv
FILTER F175W d F175W.conv
FILTER F180M d F180M.conv
FILTER F187N d F187N.conv
FILTER F187W d F187W.conv
FILTER F190N d F190N.conv
FILTER F196N d F196N.conv
FILTER F200N d F200N.conv
FILTER F204M d F204M.conv
FILTER F205W d F205W.conv
FILTER F207M d F207M.conv
FILTER F212N d F212N.conv
FILTER F215N d F215N.conv
FILTER F216N d F216N.conv
FILTER F222M d F222M.conv
FILTER F237M d F237M.conv