Hello, Recently I have been converting most of my scientific data to the HDF5 format. HDF5 is a powerful, high performance data format library. I found an absolutely wonderful open source code, PyTables, which provides an HDF5 interface. It adds enormous value to HDF5 by making it much easier to use, and exposing a lot of the complex functionality that HDF5 supports (such as variable-length records). http://www.pytables.org/moin I would really appreciate it if you guys would consider adding PyTables. I would definitely convert a lot of my existing extensions and processing tools to use PyTables- for example, when I analyze trajectories to find hydrogen bond data and use that to render long movies, PyTables makes it a lot easier (I already used the Chimera headers to build my own copy of PyTables on Linux, but it would be a lot more painful to do on Windows). PyTables depends on numarray (although it also provides Numeric Python support). I'd like to see numarray in Chimera as well (although I could live with just Numeric support) Dave