# get_bkg_fit_plot¶

sherpa.astro.ui.get_bkg_fit_plot(id=None, bkg_id=None)

Return the data used by plot_bkg_fit.

Parameters: 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. model – An object representing the data used to create the plot by plot_bkg_fit. a sherpa.astro.plot.BkgFitPlot instance sherpa.utils.err.ArgumentErr – If the data set does not contain PHA data. sherpa.utils.err.IdentifierErr – If the bkg_id parameter is invalid. sherpa.utils.err.ModelErr – If no model expression has been created for the background data.

get_bkg_plot()
Return the data used by plot_bkg.
get_bkg_model_plot()
Return the data used by plot_bkg_model.
plot_bkg_fit()
Plot the fit results (data, model) for the background of a PHA data set.

Examples

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

>>> bplot = get_bkg_fit_plot()
>>> print(bplot)


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

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


The fit plot consists of a combination of a data plot and a model plot, which are captured in the dataplot and modelplot attributes of the return value. These can be used to display the plots individually, such as:

>>> b2.dataplot.plot()
>>> b2.modelplot.plot()


or, to combine the two:

>>> b2.dataplot.plot()
>>> b2.modelplot.overplot()


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

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