Hi, avwmerge++ is a complete recoding of avwmerge in C++. It contains some improvements, without any change in functionality, and so I would definitely try this. If it still doesn't work, let us know. All the best, Mark Robert Terwilliger wrote: >Dear FSL, > >We are using the 64-bit Linux version of fsl. We are >using avwmerge to merge large Analyze volumes. > >This works for merging two 1.4G volumes into a single >2.8G volume. However, it breaks down when trying to >merge two 2.3G volumes into a single 4.6G volume. > >Since our machine is 64-bit, it shouldn't be an >address space issue as far as I can tell. > >So I have two questions: > >1) What is the difference between avwmerge and >avwmerge++? > >2) Would avwmerge++ possibly 'address' this problem >(pardon the pun...) > >Regards, > >Robert Terwilliger >Laboratory of Neurocognitive Development >University of Pittsburgh > >