To retrieve both HET and DIMM image quality histogram statistics, choose the year and cycle you are interested in.
Note: HET GFWHM image quality statistics have been recorded since the second period of of 2002. Starting in the third period of 2003 the IQ is also measured off the FIF guider in addition to LRS pre images. Starting in the 2nd period of 2005 the LRS FWHM is now set to a FWHM instead of a GFWHM and the FWHM on the FIF comes from saved images using the same software as is used on the LRS. DIMM image quality statistics have been recorded since 2002-1. Also, all ring wall louvers have been installed as of the 2002-2 cycle.