.. _SHEPSFFieldParameters:
  
Shear PSF Field Parameters
--------------------------
  
$SetSchemaPath she/euc-she-PsfFieldParameters.xsd 
  
Data product name
=================
.. DataProductNameStart
   
$PrintDataProductName
   
.. DataProductNameEnd
   
Data product custodian
======================
.. DataProductCustodianStart
   
$PrintDataProductCustodian
   
.. DataProductCustodianEnd
   
Name of the Schema file
=======================
.. NameSchemaStart
   
$PrintSchemaFilename
   
.. NameSchemaEnd

Last Edited for DPDD Version
____________________________
.. DpddVersionTagStart

1.1

.. DpddVersionTagEnd
      
Data product elements
=====================
.. DataProductElementsStart
   
$PrintDataProductElements

.. DataProductElementsEnd
   
Processing Element(s) creating/using the data product
=====================================================
.. PECreatorStart

**Creators:**

* SHE_PSFToolkit_Fitting_FitPSFs

**Consumers:**

* SHE_PSFToolkit_ModelPSFs
   
.. PECreatorEnd
   
Processing function using the data product
==========================================
.. PFUsingStart

SHE
   
.. PFUsingEnd
   
Detailed description of the data product
========================================
.. DetailedDescStart

PSF field parameters product, giving the telescope state for a given exposure. Parameterisation for this data model 
largely consists of a subset of those included in the she_psfcalibration data product, as it is limited to only those 
parameters which are expected to vary on an exposure-to-exposure time scale (or on a time scale less than calibration 
observation cadence). Finalised Format TBD.

The FITS output file will contain the following information:

Output File
===========

The FITS output file will contain the following information:

**HDU List**

   
*Primary Header*
________________

The primary head will contain the following additional information:

$PrintPrimaryHeader fit/euc-she.xml she.psfFieldParameters

*Telescope Mode Parameters*
___________________________

These are parameters that describe mirror movements, based on a ray tracing model. 

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters SheTelescopeModeParams

*Zernike Basis Coefficients*
_________________________

These coefficients are the weights for the she.psfLevel2CalibrationParameters.SheBasisZernikeModeParams to find the 
best fit Zernike parameters from the array of Zernike modes at different roll angle and solar-aspect angle using the 
roll angle and solar-aspect angle of the field observation. 

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters SheZernikeBasisCoeffs

*Zernike Mode Parameters*
_________________________

The Zernike mode parameters describe the wavefront errors as a set of orthoganol functions that change in radial
and azimuthal degree. For field fitting, many parameters are 
derived from the solar-aspect and roll angle using the Level 2 calibration product, but others that are strongly 
linked to focus are fitted for. The coefficients are a combination of the modes that are related to different optical effects and polynomial 
functions that describe the variation across the field-of-view.

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters SheZernikeModeParams

*Fisher Matrix Parameters*
___________________________

The Fisher matrix parameters calculated from the maximum likelihood fit of the model to the stars in these field.

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters ShePsfFieldFisherMatrix

*Star Residual Parameters*
___________________________

Details of the fit for each star used: how well the PSF models each individual star.

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters ShePsfFieldStarResiduals

*Toolkit Input Parameters*
___________________________

The parameters used in the configuration of the SHE_PSF_Toolkit software.

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters SheToolkitInputParams

*Diagnostic Parameters*
___________________________

The chi-squared and number of degrees of freedom of the fit. 

$PrintHDUTableContents fit/euc-she.xml she.psfFieldParameters ShePsfDiagnostics

.. DetailedDescEnd