cxc.harvard.edu/cdo/xray_primer.pdf
The most common data products that can be extracted out of an events list are:
- Image—bin on spatial-axes, lose energy and time information
- Spectra—bin on spectral-axis, lose spatial and time information
- Lightcurves—bin on time-axis, lose spatial and energy information
- Source Lists—identify regions in spatial, energy, and time coordinates cor- responding to sources