Hi Markus, See URL: http://root.cern.ch/root/htmldoc/TTree.html#TTree:AutoSave You cannot revover if you do not have one Tree header written to the file. In theory, one could imagine to recover most of the Tree in this case by providing an external definition of the Tree, but this is not implemented. Rene Brun Markus Huening wrote: > > Dear Rooters, > > I have a problem with some Tree I saved into a file. It does not appear in > the list of keys although from the size of the file I can judge that it > must be there. By accident I must have deleted the tree in memory before I > closed the corresponding file. > Is there a way to reconstruct the data? > > Greetings > > Markus Huening > > ====================================================== > Markus Huening > Desy/FDET > Notkestrasse 85 > D-22607 Hamburg > Germany > > Tel: ++49 (040)8998-3030 > Fax: ++49 (040)8998-3094 > e-mail: markus.huening@desy.de
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