Author: 	Jeannie Walldren
Date:		2008-06-05
History:
	2008-06-15 Jeannie Walldren 
			- Original version
	2009-05-21 Jeannie Walldren 
			- Updated documentation
			- A comparison of the IDL CISSCAL 3.6 cassimg_linearise.pro to IDL CISSCAL 3.3  cassimg_linearise.pro shows no change.




This directory contains calibration files for ISIS 3 CISSCAL's linearity corrections.

These calibration files were created using the information from the
correction factor tables of the same names in the idl file cassimg_linearise.pro.
If new calibration information becomes available, the following text files should 
be updated:
	WAC0.lut
	WAC1.lut
	WAC2.lut
	WAC3.lut
	NAC0.lut
	NAC1.lut
	NAC2.lut
	NAC3.lut



*** Excerpt taken from cassimg_linearise.pro:

;	These are the correction factor tables from the referenced documents
;	For each gain state there are a list of DNs where measurements
;	  were performed and the corresponding correction factors C
;	The correction is then performed as DN'=DN*Cdn
;	Where Cdn is an interpolation for C from the tabulated values

;	For ease of interpolation, I have included a value of C for DN=0
;	by duplicating the correction factor for the lowest measured DN

;	WAC tables for gains 0, 1, 2, 3
  WAC0 = [[	   0.0,   55.3,  153.5,  250.7,  300.5,  694.9, 1167.7, $
		1472.7, 1805.8, 2430.6, 2844.5, 3405.9, 4096.0 ], $
	[	 0.885,  0.885,  0.957,  0.976,  0.977, 0.986,  1.006, $
		 0.997,  0.976,  1.047,  1.101,  1.092, 1.168 ]]

  WAC1 = [[	   0.0,   30.3,  182.4,  257.6,  359.6,  765.0, 1118.5, $
		1619.2, 1917.9, 2312.8, 2803.6, 3384.3, 4096.0 ], $
	[	 0.839,  0.839,  0.977,  0.988,  0.991,  0.998, 1.001, $
		 1.006,  1.009,  1.012,  1.017,  1.023, 1.029 ]]

  WAC2 = [[	   0.0,   21.8,  121.2,  240.3,  320.1,  598.8, 1034.9, $
		1509.9, 1827.8, 2219.6, 2687.7, 3231.7, 3902.4, 4096.0 ], $
	[	 0.915,  0.915,  0.985,  0.994,  0.995,  0.997,  1.000, $
		 1.002,  1.002,  1.004,  1.007,  1.010,  1.020,  1.020 ]]

  WAC3 = [[	   0.0,   47.2,  131.4,  256.5,  340.8,  760.7, 1012.1, $
		1514.2, 1848.6, 2183.0, 2681.0, 3177.4, 3830.6, 4096.0 ], $
	[	 0.895,  0.895,  0.965,  0.989,  0.992,  1.000,  1.002, $
		 1.005,  1.006,  1.007,  1.009,  1.011,  1.015,  1.016 ]]


;	NAC tables for gains 0, 1, 2, 3
  NAC0 = [[	   0.0,   75.0,  221.7,  294.2,  366.6,  440.4,  855.1, $
		1351.2, 1522.0, 1766.9, 2012.0, 2288.3, 2819.3, 3496.7, $
		4096.0 ], $
	[	 0.958,  0.958,  0.972,  0.977,  0.980,  0.979,  1.008, $
		 0.957,  0.944,  0.976,  1.071,  1.130,  1.121,  1.068, $
		1.080 ]]

  NAC1 = [[	   0.0,  121.4,  200.3,  281.1,  401.4,  801.9, 1201.5, $
		1439.5, 1755.4, 2068.9, 2534.9, 2997.4, 3603.9, 4096.0 ], $
	[	 0.987,  0.987,  0.997,  0.995,  0.995,  0.996,  0.997, $
		 0.999,  1.001,  1.004,  1.008,  1.013,  1.020,  1.024 ]]

  NAC2 = [[	   0.0,   34.8,  102.7,  203.3,  272.0,  407.8,  815.1, $
		1221.9, 1493.0, 1757.1, 2165.0, 2565.4, 3092.6, 3741.8, $
		4096.0 ], $
	[	 0.974,  0.974,  0.990,  1.000,  0.997,  0.997,  0.998, $
		 0.998,  0.999,  1.003,  1.002,  1.004,  1.008,  1.014, $
		1.017 ]]

  NAC3 = [[	   0.0,   71.6,  212.7,  282.8,  354.0,  423.4,  849.8, $
		1273.8, 1415.4, 1697.5, 2118.3, 2537.5, 3091.9, 3640.4, $
		4096.0 ], $
	[	 0.986,  0.986,  0.997,  0.999,  0.998,  1.001,  0.998, $
		 0.998,  0.998,  0.999,  1.001,  1.002,  1.005,  1.009, $
		1.011 ]]