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The high-speed tap (HST) pipeline acquired raw, complete CCD frames directly
from the camera using a secondary data pathway that is available only on
the ground. These frames were captured by the ACIS EGSE workstation
and written to disk as FITS images. Software running on the ACIS EGSE
processed these images to correct for bias and to extract events, producing
FITS event lists. This process and the format of the high-speed tap event
lists are described in Section 3.2.
The high-speed tap was used in all phases of ACIS calibration at the XRCF.
An archive of event lists is maintained by the Calibration Group
the AXAF Science Center and is available on the web at