Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/xsstep.html
AHELP for CIAO 4.11 Sherpa v1

xsstep

Context: models

Synopsis

The XSPEC step model: step function convolved with gaussian.

Syntax

xsstep

The xsstep model is an additive model component.

Description

The model is described at [1] .


Example

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

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

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.Energy   thawed          6.5            0          100        keV
   mdl.Sigma    thawed          0.1            0           10        keV
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

Energy

The start energy, in keV.

Sigma

The gaussian sigma, in keV.

norm

The step amplitude.

References

XSPEC version

CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.0e

Bugs

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