This task displays an RGS Spectroscopy spatial–dispersion plot (displaying photon position in beta or lambda space) and an energy–dispersion plot (displaying photon energy against beta angle or lambda in the dispersion direction) created from an RGS event list by evselect. These plots provide extremely useful diagnostics of RGS spectroscopy data, allowing the user to gauge the potential cross-contamination of the RGS orders by pileup, scattering and partial events.
Details of the observation are also displayed in each plot. These include the observation and exposure IDs and the observation start and stop times.
The plots may be displayed in monotone or using a number of colour tables (e.g grey-scale, rainbow, heat), and any valid PGPLOT graphics device may be specified for the output. A linear, sqrt or logarithmic colour mapping can be specified by the user.
rgsregions extraction region files are overlaid on the energy–dispersion and spatial–dispersion plots. Examples of these are shown in Figure 1. in which a spatial extraction region and order extraction regions are overlaid on the full images.
rgsimplot produces an energy-dispersion plot in a format defined by the device parameter.