ESO Archive Frequently Asked Questions

Why is the number of files requested different from the number of files downloaded?

During the Calselector process, some files may be associated several times to different datasets, but they will be downloaded only once. This is the reason why you may observe such differences between the number of requested files and the number of (unique) files available for download. In a future release, only the number of (unique) files available for download will be displayed.

Please note that when using the old way to download raw data, night log files are not included when the size to be displayed on the web interface is computed whereas they are included in the list of files available for download. For instance, for a given request, the number of files is 200 on the web page but 212 in the notification as 12 night logs are available.