... HST . ... Instructions on how to retrieve reference files . ... Data . ... The retrieval of Reference Files is a little more complicated than retrieving HST data. ... Reference Files are retrieved via the HST Archive site as follows: . In the form enter only the first nine characters of the file name followed by an asterisk. ... Override the retrieval options: In the Retrieval Options window next to your Archive username and password go to the bottom of the "Retrieval Options" window. ...