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.