These m-files are useful for creating the blurred blob footprints that are needed for SPECT reconstruction with depth-dependent detector response (and nonuniform attenuation compensation) using ASPIRE with the "3s" system model (see "i proj3" or the ASPIRE 3D user's guide). Type "help blob_li_blur" (or look at blob_li_blur.m) for more details. See blob_example.csh for an example recon script. That script was used for the June 2004 PMB paper by Yendiki and Fessler on 3D SPECT using blobs. Email questions to nastazia@umich.edu