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If you run a web browser on a SLAC machine, then go to the
dataCatalog, http://glast-ground.slac.stanford.edu/DataCatalog,
navigate to the data of interest, e.g., MC-Tasks -> ServiceChallenge
-> backgnd-GR-v13r5p5-Day -> runs -> gcr, then click on the "Show
Files" link, then click on any of the individual run numbers, e.g.,
"000000" is stream 0 in the task. You will be asked if you wish to
download the file. As you will be running on a SLAC machine, the
entire SLAC disk environment will be visible for you to select an
appropriate destination.

You can also download files to your home site by running the web
browser on one of your own machines. The dataCatalog downloader
should just work.