sherpa.astro.ui.get_bkg_plot(id=None, bkg_id=None, recalc=True)

Return the data used by plot_bkg.

  • id (int or str, optional) – The data set that provides the data. If not given then the default identifier is used, as returned by get_default_id.

  • bkg_id (int or str, optional) – Identify the background component to use, if there are multiple ones associated with the data set.

  • recalc (bool, optional) – If False then the results from the last call to plot_bkg (or get_bkg_plot) are returned, otherwise the data is re-generated.


data – An object representing the data used to create the plot by plot_data. The relationship between the returned values and the values in the data set depend on the analysis, filtering, and grouping settings of the data set.

Return type:

a sherpa.astro.plot.BkgDataPlot instance


See also


Return the default data set identifier.


Plot the background values for a PHA data set.


Create the data needed to create the “data plot” for the background of the default data set and display it:

>>> bplot = get_bkg_plot()
>>> print(bplot)

Return the plot data for data set 2, and then use it to create a plot:

>>> b2 = get_bkg_plot(2)
>>> b2.plot()

Return the plot data for the second background component to the “jet” data set:

>>> bplot = get_bkg_plot('jet', bkg_id=2)