Last modified: December 2025

URL: https://cxc.cfa.harvard.edu/sherpa/ahelp/xspartcov.html
AHELP for CIAO 4.18 Sherpa

xspartcov

Context: models

Synopsis

The XSPEC partcov convolution model: partial covering

Syntax

xspartcov

The xspartcov model is a convolution model component.

Description

The model is described at [1] .


Example

>>> create_model_component("xspartcov", "mdl")
>>> print(mdl)

Create a component of the xspartcov model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.CvrFract thawed          0.5            0            1           

ATTRIBUTES

The attribute for this object is:

Attribute Definition
CvrFract The covering fraction (0 to 1).

Notes

Unlike XSPEC, the convolution model is applied directly to the model, or models, rather than using the multiplication symbol.

References

[1]

Changes in CIAO

Added in CIAO 4.13

XSPEC version

CIAO 4.18 comes with support for version 12.14.0k of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.14.0k

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.