get_bkg_chisqr_plot

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

Return the data used by plot_bkg_chisqr.

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.
Returns:

source – An object representing the data used to create the plot by plot_bkg_chisqr.

Return type:

a sherpa.astro.plot.BkgChisqrPlot instance

Raises:

See also

get_bkg_delchi_plot()
Return the data used by plot_bkg_delchi.
get_bkg_ratio_plot()
Return the data used by plot_bkg_ratio.
get_bkg_resid_plot()
Return the data used by plot_bkg_resid.
plot_bkg_chisqr()
Plot the chi-squared value for each point of the background of a PHA data set.

Examples

>>> bplot = get_bkg_chisqr_plot()
>>> print(bplot)
>>> get_bkg_chisqr_plot('jet', bkg_id=1).plot()
>>> get_bkg_chisqr_plot('jet', bkg_id=2).overplot()