Discretionary Time proposals were performed under the `Open Time' budget and therefore appear under OT in the above lists.
Many interesting scientific targets were also observed
during the `Performance Verification Phase', as part of the
AOT comissioning and during the mission for specific calibration purposes.
All these data are included in the ISO Data Archive and can be retrieved.
But, in many cases, it is not easy to use these data
and instrument experts should be contacted before one tries to
interpret the observations scientifically.