.. _nika-output-data:
.. _QRSdataDescription:

.. index::
    Nika; Output data
    Nika; Export data
    QRS data type

Output data
===========

QRS — Internal Igor storage
-----------------------------

.. Figure:: media/OutputData1.png
   :align: center
   :width: 100%

Data are stored internally within the Igor experiment (when selected) in
``root:SAS:``, organized in folders named by sample and integration type:

* ``nameOfSample_C`` — circular average
* ``nameOfSample_Angle_halfWidth`` — sector average around direction *Angle*
  with sector half-width *halfWidth*

Wave names
~~~~~~~~~~

**X-axis data**

``q_NameOfSample_C`` (or ``_Angle_halfWidth``) — Q vector in Å\ :sup:`-1`

``t_NameOfSample_C`` (or ``_Angle_halfWidth``) — 2θ, when output is with
respect to two-theta

``d_NameOfSample_C`` (or ``_Angle_halfWidth``) — d-spacing, when output is
with respect to d

**Y-axis data**

``r_NameOfSample_C`` (or ``_Angle_halfWidth``) — intensity (if calibrated, in
units of cm\ :sup:`-1`; thickness is internally converted to cm)

**Error**

``s_NameOfSample_C`` (or ``_Angle_halfWidth``) — uncertainty for intensity

**Other**

``w_NameOfSample_C`` (or ``_Angle_halfWidth``) — width of each Q/d/2θ bin.
Used for LUT output and bin-width smearing. For linear binning this is
constant (Max − Min) / numOfPoints; for log binning it varies with bin
position.

Line profile data
~~~~~~~~~~~~~~~~~

For line profile output, wave names include a profile indicator and the Q value
at which the profile was calculated. For example, a GI Vertical line profile
might be named::

    gc_saxs_395__GI_VLp_0.0077

where:

* ``gc_saxs_395_`` — part of the source image name
* ``GI_VLp_`` — GI Vertical Line profile indicator
* ``0.0077`` — the Q\ :sub:`y` value in Å\ :sup:`-1`

Exported ASCII files contain columns: Int, error, Q, qx, qy, qz, with a
header and column labels.

Waves saved in Igor for line profiles:

``r_NameOfSample_ProfileIndicator_Qvalue`` — intensity

``q_NameOfSample_ProfileIndicator_Qvalue`` — Q [Å\ :sup:`-1`]

``s_NameOfSample_ProfileIndicator_Qvalue`` — uncertainty

``qy_NameOfSample_ProfileIndicator_Qvalue`` — Q\ :sub:`y` [Å\ :sup:`-1`]

``qz_NameOfSample_ProfileIndicator_Qvalue`` — Q\ :sub:`z` [Å\ :sup:`-1`]

``qx_NameOfSample_ProfileIndicator_Qvalue`` — Q\ :sub:`x` [Å\ :sup:`-1`]
(generated only for GI profiles)

Each intensity wave has an attached wave note containing useful metadata, for
example::

    CalibrationFormula=1*((Sa2D));CurrentMaskFileName=A mask_mask;
    QvectorNumberPoints=300;CircularAverage=1;

ASCII export
------------

See :ref:`ASCII export from Irena <export_data>`.