Create a ``dummy" response, covering a given energy range.
XSPEC> dummyrsp [<Low Energy> [<High Energy> [<No. of ranges> [<logarithmic or linear>]]]]
When examining several aspects of the current model, such as plotting it or determining flux, XSPEC uses the current evaluation array. This, in turn, is defined by the current response files being used, which depend on the various detectors. For example, low energy data sets (such as those from the EXOSAT LEs) may have responses covering 0.05 to 2 keV, while non-imaging proportional counters can span the range from 1 to 30 keV. If the user wishes to examine the behavior of the model outside of the current range, then he or she temporarily must create a dummy response file that will cause the model to be evaluated from <Low Energy> to <High Energy>, using <no. of ranges> as the number of steps into which the range is logarithmically or linearly divided. The initial default values for the arguments are .01 keV, 100 keV and 200 logarithmic energy steps. Note that the dummyrsp has no physically correct way of mapping the model into the data PHA channels, so the user should not try to fit-or plot-the data while the dummyrsp is active. The previous response matrices can be reimplemented with the response command, with no arguments. Any use of the data and notice commands also will replace the dummy response with a correct set of matrices.