Dear all, to mam : your referee is a dumb, clearly ! feff8 can do both. One more quick and dirty referee. Some journals do money nowadays. Easy to answer there is an EXAFS card, which is not made for XANES, clearly... to all : gnxas is not designed to be easy to use; it is not designed as a "black box". it needs some effort and that's an opposite way to feff. this strategy has its own pros and cons; and corresponds to what was taught in Italy and France in the 90's on XAFS ("work hard school"). I survived it ... But the authors have considerably modified they vision recently (open to actinides) and it is becoming more more accessible, tough not as easy as feff. For instance, the great biotech group at SSRL widely use it. One advantage of their strategy is that not everyone can claim to do "state of the art" EXAFS simulation without some deep understanding of what's going on. I've seen, in contrast, papers in which people were claiming so much about feff (so-call "good and bad things") but their calculations were far from optimum (they are never, I know for sure myself !) so their feff "evaluation" was quite very poor in fact. also gnxas is not just for glasses. it is for everything of course. they applied it often to glasses because it corresponds to what physicists where highly interested in the 90's. Nowadays the situation is quite different because environmental and biological sciences invaded the field but gnxas is highly involved in the biotech field at SSRL, for instance. With gnxas, this is not to happen soon because you always feel to be a "primitive and modest gnxas user", given the intrinsic complexity of the program and its numerous options and, I must say, its documentation that is not always updated as the code is; leaving some perplexity, if not bad mood sometimes. Also, the graphical subroutine uses some kind of unpopular primitive odd (dumb) library that is not always very easy to find or to install (many alternatives would be much more easier ...) Finally, their supported plateforms is not typical of what users now use nowadays. Surprisingly, they promote either very expensive proprietary (HP UNIX, VMS etc) or so-calmled "open source" free plateforms (Linux)(Red Hat is no more but a gnxas distribution for RedHat is still available; so there is some inconsistencies here in the gnxas policies). That's their choice but it is getting more and more 90's outdated, not reflecting 2006. But basically, a modernized front end of gnxas would be great. But one has to get into that programming to make it easy-to-click (like many would like too). With Atoms of Bruce Ravel, there are options to prepare these so-odd files needed for gnxas. this is already a wonderful first step. Any decent model of the EXAFS for high Z cations should be done with that program, basically. Sixpack, ifeffit, but mostly FEFF, are missing the multi-electronic excitation (MEE) modeling. This is well known and their authors are well aware of this limitation. The atomic-XAFS vs. MEE "battle" a few years ago contributed to this unfortunate segmentation. But most users don't even "smell" these MEE's (or AXAFS if you prefer) in their data and process them straight away. they cannnot be 100% blamed, MEE are also quite vicious features. but more and more is done that is not appropriate because of these nice GIUs (athena, sixpack). so it is difficult to decide what to do. Also, like others, I ve found that MEE are more and more visible as much as the metal concentration probed is getting lower and lower (comparative study of Mn permanganate solutions at more and more dilutions makes that the MEE is increadingly more detected in the normalized EXAFS). And this now standard to look at diluted metals, in environmental samples with these 3rd generation, highly-stabilized sources (SLS for instance). But we are getting more or less overflowded with data with all these new sources everywhere and funding agencies need papers and we go straight into it... MAM : I won't blame them not to have Windows version as I know many other GREAT programs, incl. yours, that run only on Windows (still, what a limitation to be better quoted...) as they could easily run on other plateforms... (get rid of these registers !). I'm thinking also to the viper/xanda series. So, any close future to get more gnxas done, if one does not want to jump into it... and still the best exafs-fitting package for sure. We all wish to be using it more but this is not gonna happen soon. FF