Below are links to java loops of weighting function and transmittance plots for the 1.38um and 0.86um ABI bands.  The 50% power points with equal weights (of 1) were used as endpoints for the ABI 1.38um plots.  While the 1% power points and their corresponding SRF values were used for the MODIS Band 26 plots.  The weighting function was computing using transmittance squared to reflect the incoming and outgoing paths radiation at 1.38um/0.86um must take to be detected by satellite sensors.  The formula used for weighting function is d (tau)^2 / d log(p).  The transmittance plots are also transmittance squared for the same reason as the weighting function.  The process of computing weighting fucntion involved reading in raw MODTRAN data, using IDL to create ASCII files with desired information, and finally using IDL to compute weighting function and create the plots.  The below weighting function and trasmittance plots are for a tropical temperature profile encompassing a wide range of total precipable water values.  Notice how the 1.38um band transmittance and weighting function plots(which is located in a atmospheric water vapor absorption feature) change significantly with changes in TPW, while the 0.86 band (which is not in an atmospheric water vapor absorption feature) hardly changes with changes in TPW.