I am working on Atmospheric correction of Landsat ETM+ image (Path= 150, Row= 37) using FLAASH module of ENVI software. When i input Radiance image, ENVI software prompt "Enter ASCII file name containing wavelengths and FWHM". Can any one tell how to create this file? FWHM values for Landsat ETM+ image is same for all or different for every Landsat ETM+ image? How can i get these values? Also tell how to get "Flaash Parameter Template File" which is the requirement of Flaash module (when pressed restore button)?