Line - Gaussian

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===Fitting with a Gaussian===
===Fitting with a Gaussian===
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The Gaussian fit component allows the addition of a line into the model used to fit a RHESSI spectrum. It is normally used to fit instrumental lines (for instance, lines created by interactions of energetic photons with the tungsten grids) or atomic transition lines not accounted for in the [http://chianti.nrl.navy.mil/chianti.html CHIANTI] database. The integrated intensity, a[0], is the height of the peak of the gaussian in units of flux. The centroid, a[1], gives the location of the center of the gaussian in keV. The third parameter, a[2], gives a measure of the [http://en.wikipedia.org/wiki/Standard_deviation standard deviation] of the gaussian in keV.
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The Gaussian fit component allows the addition of a line into the model used to fit a RHESSI spectrum. It is normally used to fit instrumental lines (for instance, lines created by interactions of energetic photons with the tungsten grids) or atomic transition lines not accounted for in the [http://chianti.nrl.navy.mil/chianti.html CHIANTI] database. The integrated intensity, a[0], is the height of the peak of the gaussian in units of flux. The centroid, a[1], gives the location of the center of the gaussian in keV. The third parameter, a[2], gives a measure of the [http://en.wikipedia.org/wiki/Standard_deviation standard deviation] of the Gaussian in keV.
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[[Category:Software]]
[[Category:Software]]

Latest revision as of 01:49, 23 January 2010

Contents

Line (Gaussian)

Introduction

A Gaussian can be used to fit any lines that appear in the spectrum. The component allows the user to set the intensity (count flux) of the line, it's location (in keV), and its width (by setting it's full width half maximum)

Parameters

Line - Single Gaussian Function (width in Sigma)

Fitting with a Gaussian

The Gaussian fit component allows the addition of a line into the model used to fit a RHESSI spectrum. It is normally used to fit instrumental lines (for instance, lines created by interactions of energetic photons with the tungsten grids) or atomic transition lines not accounted for in the CHIANTI database. The integrated intensity, a[0], is the height of the peak of the gaussian in units of flux. The centroid, a[1], gives the location of the center of the gaussian in keV. The third parameter, a[2], gives a measure of the standard deviation of the Gaussian in keV.

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