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.. NPOL Reference File TSR master filee.
TSR 2012-03: NPOL Reference File
================================
NPOL Reference File TSR
=======================
.. abstract::
:author: Nadezhda Dencheva, Warren Hack
:date: 12 Oct 2010
The HST pipeline originally used two types of reference files to correct for distortion:
``IDCTAB`` files which contain the coefficients for a polynomial correction and
``DGEO`` files which are images with the residual distortion. A new format for the residual
distortion, called ``NPOL`` files (extension ``_npl.fits``), is presented in this document.
The conversion from ``DGEO`` files to ``NPOL`` files is described and an example of the format is given
using ACS/WFC F606W filter. Tests of the conversion procedure show that the
differences between the ``DGEO`` files and ``NPOL`` files are of the order of :math:`10^{-4}`
pixels.
Contents:
.. toctree::
:maxdepth: 2
npol_tsr
Indices and tables
==================
* :ref:`genindex`
* :ref:`search`
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