plot_bkg_fit_delchi¶

sherpa.astro.ui.plot_bkg_fit_delchi(id=None, bkg_id=None, replot=False, overplot=False, clearwindow=True)¶

Plot the fit results, and the residuals, for the background of a PHA data set.

This creates two plots - the first from plot_bkg_fit and the second from plot_bkg_delchi - for a data set.

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.
replot (bool, optional) – Set to True to use the values calculated by the last call to plot_bkg_fit_delchi. The default is False.
overplot (bool, optional) – If True then add the data to an exsiting plot, otherwise create a new plot. The default is False.
clearwindow (bool, optional) – When using ChIPS for plotting, should the existing frame be cleared before creating the plot?

Raises:

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.

See also

get_bkg_fit_plot(): Return the data used by plot_bkg_fit.
get_bkg_delchi_plot(): Return the data used by plot_bkg_delchi.
plot(): Create one or more plot types.
plot_bkg(): Plot the background values for a PHA data set.
plot_bkg_model(): Plot the model for the background of a PHA data set.
plot_bkg_fit(): Plot the fit results (data, model) for the background of a PHA data set.
plot_bkg_fit_resid(): Plot the fit results, and the residuals, for the background of a PHA data set.
plot_fit(): Plot the fit results (data, model) for a data set.
set_analysis(): Set the units used when fitting and displaying spectral data.

Examples

Plot the background fit and residuals (normalised by the error) to the default data set:

>>> plot_bkg_fit_delchi()