SIMPLE = T / conforms to FITS standard BITPIX = 8 / array data type NAXIS = 0 / number of array dimensions EXTEND = T COMMENT The following file is from Jim Gunn, from June 2001. It should be self-COMMENT explanatory; for most purposes, you will want to use the second column. COMMENT Consider this file preliminary. COMMENT COMMENT These filter curves have been used to calculate the effective wavelengthCOMMENT s and the qtdl/l (see Chapter 8 of the Black Book) of the filters; the vCOMMENT alues are: COMMENT COMMENT u 3551 0.0171 COMMENT g 4686 0.0893 COMMENT r 6166 0.0886 COMMENT i 7480 0.0591 COMMENT z 8932 0.0099 COMMENT COMMENT Table Caption For Response Functions COMMENT COMMENT The first column is the wavelength in \AAngstroms. COMMENT COMMENT The second column (respt) is the quantum efficiency on the sky looking tCOMMENT hrough 1.3 airmasses at APO for a point source. COMMENT COMMENT The third column (resbig) is the QE under these conditions for very largCOMMENT e sources (size greater than about 80 pixels) for which the infrared scaCOMMENT ttering is negligible. The only filters for which the infrared scatteriCOMMENT ng has any effect are r and i; the scattering in the bluer chips is neglCOMMENT igible, and the z chips are not thinned and the phenomenon does not exisCOMMENT t. COMMENT COMMENT The fourth column (resnoa) is the response of the third column with {\itCOMMENT no} atmosphere, and the fifth column is the assumed atmospheric transpaCOMMENT rency at {\it one} airmass at APO. COMMENT COMMENT The tables were constructed using monochromator illumination of the cameCOMMENT ra with a bandpass of about 100 \AA, sampled for the u filter at 50 \AA COMMENT intervals and for the others at 100 \AA intervals. These measurements wCOMMENT ere compared with measured responses of the component filters and detectCOMMENT ors and three additional points were interpolated using these data, two COMMENT at the extreme toes and one additional (in g, r, and i) at the point of COMMENT the beginning of the sharp cutoff of the shortpass interference filter. COMMENT These points are necessary in order to make spline interpolation of theCOMMENT response data well-behaved. These spline-interpolated response data werCOMMENT e then multiplied by measured aluminum reflectivities and scaled atmosphCOMMENT eric transmission to produce the tables below. The overall normalizationCOMMENT is somewhat uncertain, but this uncertainty does not affect the shapes.COMMENT Note, however, that there has been no attempt to remove the finite resoCOMMENT lution of the monochromator measurements. These tables are the {\it averCOMMENT ages} of the responses for all six of the camera chips with a given filtCOMMENT er. The responses are in general very similar except in the z band, wherCOMMENT e the nonuniformity of the infrared rolloff, presumably associated with COMMENT varying thickness of the epitaxial layer or perhaps the gate structures COMMENT in these thick devices, introduces variations in the effective wavelengtCOMMENT hs of the filters of order 100 \AA. We are currently working on better rCOMMENT esponse functions and will present them when they become available, but COMMENT these will suffice for most applications. In all cases the first point iCOMMENT s a measured point, so the grid of wavelengths at which measurements exiCOMMENT st is a subset of the wavelength lists here. COMMENT HISTORY Converted from ASCII, 2013-02-05T18:20:52.137558 +0000. HISTORY Converted using convert_filters.py, revision 142849. 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