The HEASARC is running nominally. If you are trying to download a lot of data, please consider using the AWS cloud copy of most HEASARC data. As an alternative to locally installing HEASoft, SciServer is an online platform which has the software installed and data available when you login.
clear events
Deletes the output event list from extract, and points back to the data entered with the CHOOSE or READ commands. If you give an EXTRACT EVENTS, then Xselect will use the resultant events file in future computations, until you give the command CLEAR EVENTS.