Define characteristics used in rebinning the data (for plotting
purposes ONLY).
XSPEC> setplot rebin <min. significance> <max no. bins>
In plotting the data from a data set (or group of data sets, see setplot
group),
adjacent bins are combined until they have a significant detection at least
as large as <min. significance> (in sigma). However, no more than
<max no. bins> may be so combined. Initial values are 0. and 1, respectively.
This arguement effects only the presentation of the data in plots. It does not
change the fitting, in particular the number of degrees of freedom. The
values given are applied to all the plotted data.