For any HST observation, the STScI data processing pipeline produces not
just one data file, but an entire set of files, known as a dataset.
All files for a particular observation have the same root name. The type
of data in each file is identified by its extension.
The raw (uncalibrated) and calibrated files are available for each dataset,
as are files describing the data quality and calibration process.
Science data are stored in the HST Archive in FITS format. To work with HST data within
the Image Reduction and Analysis Facility (IRAF), one can use the
Space Telescope Science Analysis System (STSDAS). Users interested in
displaying HST images can do so by using various FITS readers. For example
SAOimage (ds9), which can be retrieved via anonymous FTP from sao-ftp.harvard.edu in the
directory /pub/rd/ds9, runs on various systems.
Specific details about the format and content of science datasets are
described in the HST Data
We list here typical file and dataset sizes for calibrated data for each
singleton average association with 2 members associtaion with 4 members
428 MB 629 MB 1017 MB
singleton association with 2 members associtaion with 4 members
35 MB 50 MB 81 MB
singleton association with 2 members association with 3 members