Command: dmcopy "pspc.fits[bin time=1606000:1613000:20,dety=32]" timedet.fits
This example illustrates a more sophisticated binning. Using the dmlist tool, we can determine the time range of the data. We then bin on time, from the start time of the observation to the stop time in steps of 20 seconds. As the second axis of our image, we choose the detector y coordinate, binned by a factor of 32 as before.
The resulting image shows the wobble pattern of the ROSAT satellite, moving the source back and forth on the detector with time to even out detector response. The two regions in the image are the 'good time intervals' when data passed the processing filters. The gap in the middle corresponds to times when the target source was blocked by the Earth, or when the satellite was in the South Atlantic Anomaly. Photons in these times, excluded from the standard event list, make no contribution to the image.
In a Chandra or ASCA dataset, the keywords to give the time start and stop would be in the event list, and the user could omit them unless they wanted to select a specific time subset of the data.