Simon Bonnefoy / ctools

Commit 83fd12793fde630e017351c3adbdeb5ba52fd4c0

Authored by Jürgen Knödlseder
1 parent 266efaeb

Augment H.E.S.S. tutorial

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doc/source/users/tutorials/hess_dr1/fitting.rst 0 → 100644
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  1 +.. _hess_dr1_fitting:
  2 +
  3 +Fitting the model components to the data
  4 +----------------------------------------
  5 +
  6 + .. admonition:: What you will learn
  7 +
  8 + You will learn **how to fit a parametric model to the data**.
  9 +
  10 +Adjust source model name and set pivot energy to 1 TeV to bring it energy
  11 +interval of data.
  12 +Remove ``error`` attributes.
  13 +
  14 +.. code-block:: xml
  15 +
  16 + <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  17 + <source_library title="source library">
  18 + <source name="Crab" type="PointSource">
  19 + <spectrum type="PowerLaw">
  20 + <parameter name="Prefactor" value="1" scale="5.7e-18" min="0" free="1" />
  21 + <parameter name="Index" value="1" scale="-2.48" min="-4" max="4" free="1" />
  22 + <parameter name="PivotEnergy" value="1" scale="1000000" free="0" />
  23 + </spectrum>
  24 + <spatialModel type="PointSource">
  25 + <parameter name="RA" value="83.6192131308071" scale="1" free="1" />
  26 + <parameter name="DEC" value="22.0199996472185" scale="1" free="1" />
  27 + </spatialModel>
  28 + </source>
  29 + <source name="Background" type="CTAAeffBackground">
  30 + <spectrum type="PowerLaw">
  31 + <parameter name="Prefactor" value="1" scale="1e-13" min="0" free="1" />
  32 + <parameter name="Index" value="1" scale="-2.5" min="-4" max="4" free="1" />
  33 + <parameter name="PivotEnergy" value="1" scale="1000000" free="0" />
  34 + </spectrum>
  35 + </source>
  36 + </source_library>
  37 +
  38 +
  39 +.. code-block:: bash
  40 +
  41 + $ ctlike debug=yes
  42 + Input event list, counts cube or observation definition XML file [events.fits] obs_crab_selected.xml
  43 + Input model definition XML file [$CTOOLS/share/models/crab.xml] crab_models.xml
  44 + Output model definition XML file [crab_results.xml]
  45 +
  46 +.. code-block:: none
  47 +
  48 + 2018-09-11T21:17:31: +=========================================+
  49 + 2018-09-11T21:17:31: | Maximum likelihood optimisation results |
  50 + 2018-09-11T21:17:31: +=========================================+
  51 + 2018-09-11T21:17:31: === GOptimizerLM ===
  52 + 2018-09-11T21:17:31: Optimized function value ..: 98422.688
  53 + 2018-09-11T21:17:31: Absolute precision ........: 0.005
  54 + 2018-09-11T21:17:31: Acceptable value decrease .: 2
  55 + 2018-09-11T21:17:31: Optimization status .......: converged
  56 + 2018-09-11T21:17:31: Number of parameters ......: 10
  57 + 2018-09-11T21:17:31: Number of free parameters .: 6
  58 + 2018-09-11T21:17:31: Number of iterations ......: 24
  59 + 2018-09-11T21:17:31: Lambda ....................: 0.1
  60 + 2018-09-11T21:17:31: Maximum log likelihood ....: -98422.688
  61 + 2018-09-11T21:17:31: Observed events (Nobs) ...: 9675.000
  62 + 2018-09-11T21:17:31: Predicted events (Npred) ..: 9674.870 (Nobs - Npred = 0.129601074213497)
  63 + 2018-09-11T21:17:31: === GModels ===
  64 + 2018-09-11T21:17:31: Number of models ..........: 2
  65 + 2018-09-11T21:17:31: Number of parameters ......: 10
  66 + 2018-09-11T21:17:31: === GModelSky ===
  67 + 2018-09-11T21:17:31: Name ......................: Crab
  68 + 2018-09-11T21:17:31: Instruments ...............: all
  69 + 2018-09-11T21:17:31: Instrument scale factors ..: unity
  70 + 2018-09-11T21:17:31: Observation identifiers ...: all
  71 + 2018-09-11T21:17:31: Model type ................: PointSource
  72 + 2018-09-11T21:17:31: Model components ..........: "PointSource" * "PowerLaw" * "Constant"
  73 + 2018-09-11T21:17:31: Number of parameters ......: 6
  74 + 2018-09-11T21:17:31: Number of spatial par's ...: 2
  75 + 2018-09-11T21:17:31: RA .......................: 83.6230374464172 +/- 0.00241074887155303 deg (free,scale=1)
  76 + 2018-09-11T21:17:31: DEC ......................: 22.0249049416179 +/- 0.0022137104783551 deg (free,scale=1)
  77 + 2018-09-11T21:17:31: Number of spectral par's ..: 3
  78 + 2018-09-11T21:17:31: Prefactor ................: 4.81375364083447e-17 +/- 2.62970930530696e-18 [0,infty[ ph/cm2/s/MeV (free,scale=5.7e-18,gradient)
  79 + 2018-09-11T21:17:31: Index ....................: -2.71079050853091 +/- 0.0652734279744327 [9.92,-9.92] (free,scale=-2.48,gradient)
  80 + 2018-09-11T21:17:31: PivotEnergy ..............: 1000000 MeV (fixed,scale=1000000,gradient)
  81 + 2018-09-11T21:17:31: Number of temporal par's ..: 1
  82 + 2018-09-11T21:17:31: Normalization ............: 1 (relative value) (fixed,scale=1,gradient)
  83 + 2018-09-11T21:17:31: === GCTAModelAeffBackground ===
  84 + 2018-09-11T21:17:31: Name ......................: Background
  85 + 2018-09-11T21:17:31: Instruments ...............: all
  86 + 2018-09-11T21:17:31: Instrument scale factors ..: unity
  87 + 2018-09-11T21:17:31: Observation identifiers ...: all
  88 + 2018-09-11T21:17:31: Model type ................: "PowerLaw" * "Constant"
  89 + 2018-09-11T21:17:31: Number of parameters ......: 4
  90 + 2018-09-11T21:17:31: Number of spectral par's ..: 3
  91 + 2018-09-11T21:17:31: Prefactor ................: 1.80502240642969e-13 +/- 2.34991048262393e-15 [0,infty[ ph/cm2/s/MeV (free,scale=1e-13,gradient)
  92 + 2018-09-11T21:17:31: Index ....................: -2.58303579414564 +/- 0.0128891124984818 [10,-10] (free,scale=-2.5,gradient)
  93 + 2018-09-11T21:17:31: PivotEnergy ..............: 1000000 MeV (fixed,scale=1000000,gradient)
  94 + 2018-09-11T21:17:31: Number of temporal par's ..: 1
  95 + 2018-09-11T21:17:31: Normalization ............: 1 (relative value) (fixed,scale=1,gradient)
... ...
doc/source/users/tutorials/hess_dr1/index.rst
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... ... @@ -7,4 +7,6 @@ Analysing public H.E.S.S. data
7 7 :maxdepth: 1
8 8  
9 9 data
10   -
  10 + select_events
  11 + skymap
  12 + fitting
... ...
doc/source/users/tutorials/hess_dr1/select_events.rst 0 → 100644
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  1 +.. _hess_dr1_select_events:
  2 +
  3 +Selecting the relevant events
  4 +-----------------------------
  5 +
  6 + .. admonition:: What you will learn
  7 +
  8 + You will learn **how to select the relevant events for a target**
  9 + and **how to determine the useful energy range** for a set of
  10 + observations.
  11 +
  12 +Now you are ready for your first H.E.S.S. data analysis.
  13 +As first step you should create a folder that will contain your analysis
  14 +results and any intermediate data products.
  15 +Let's call this folder ``crab`` since we explain in this example how you
  16 +can analyse the data from the Crab nebula.
  17 +Create and step into the folder using
  18 +
  19 +.. code-block:: bash
  20 +
  21 + $ mkdir crab
  22 + $ cd crab
  23 +
  24 +The first step of your analysis consists in selecting the relevant events
  25 +from the observations.
  26 +In this step you can select a specific energy range, time range or region
  27 +of interest.
  28 +In the example below you will select events according to the save energy
  29 +thresholds that are defined in the effective area component of the
  30 +:ref:`instrument response functions <glossary_irf>`.
  31 +You do this by setting the hidden parameter ``usethres=DEFAULT``.
  32 +In addition, you will select all events within 2 degrees of the pointing
  33 +direction:
  34 +
  35 +.. code-block:: bash
  36 +
  37 + $ ctselect usethres=DEFAULT
  38 + Input event list or observation definition XML file [events.fits] $HESSDATA/obs/obs_crab.xml
  39 + Lower energy limit (TeV) [0.1] NONE
  40 + Radius of ROI around pointing or specified RA/DEC (degrees) (0-180) [3.0] 2.0
  41 + Start time (UTC string, JD, MJD or MET in seconds) [NONE]
  42 + Output event list or observation definition XML file [selected_events.fits] obs_crab_selected.xml
  43 +
  44 +Below is an excerpt of the log file that was created by :ref:`ctselect`.
  45 +You will find that the following energy ranges were applied for the
  46 +observations:
  47 +
  48 +* ``id=023523``: 0.871 - 100 TeV
  49 +* ``id=023526``: 0.708 - 100 TeV
  50 +* ``id=023559``: 0.661 - 100 TeV
  51 +* ``id=023592``: 0.871 - 100 TeV
  52 +
  53 +.. code-block:: none
  54 +
  55 + 2018-09-11T14:05:15: +=================+
  56 + 2018-09-11T14:05:15: | Event selection |
  57 + 2018-09-11T14:05:15: +=================+
  58 + 2018-09-11T14:05:15: === HESS observation "Crab" (id=023523) ===
  59 + 2018-09-11T14:05:15: Input filename ............: /project-data/hess/hess_dl3_dr1/data/hess_dl3_dr1_obs_id_023523.fits.gz
  60 + 2018-09-11T14:05:15: Event extension name ......: EVENTS
  61 + 2018-09-11T14:05:15: GTI extension name ........: GTI
  62 + 2018-09-11T14:05:16: === Event selection ===
  63 + 2018-09-11T14:05:16: Selected energy range .....: 0.870964 - 100 TeV
  64 + 2018-09-11T14:05:16: Requested RoI .............: Centre(RA,DEC)=(83.633333333333, 21.514444444444) deg, Radius=2 deg
  65 + 2018-09-11T14:05:16: RoI of data ...............: Centre(RA,DEC)=(83.633333333333, 21.514444444444) deg, Radius=2 deg
  66 + 2018-09-11T14:05:16: Selected RoI ..............: Centre(RA,DEC)=(83.633333333333, 21.514444444444) deg, Radius=2 deg
  67 + 2018-09-11T14:05:16: cfitsio selection .........: ENERGY >= 0.87096359 && ENERGY <= 100.00000000 && ANGSEP(83.633333,21.514444,RA,DEC) <= 2.000000
  68 + 2018-09-11T14:05:16: FITS filename .............: /var/tmp/tmp.0.QX6f0L[EVENTS][ENERGY >= 0.87096359 && ENERGY <= 100.00000000 && ANGSEP(83.633333,21.514444,RA,DEC) <= 2.000000]
  69 + 2018-09-11T14:05:16: === HESS observation "Crab" (id=023526) ===
  70 + 2018-09-11T14:05:16: Input filename ............: /project-data/hess/hess_dl3_dr1/data/hess_dl3_dr1_obs_id_023526.fits.gz
  71 + 2018-09-11T14:05:16: Event extension name ......: EVENTS
  72 + 2018-09-11T14:05:16: GTI extension name ........: GTI
  73 + 2018-09-11T14:05:16: === Event selection ===
  74 + 2018-09-11T14:05:16: Selected energy range .....: 0.707946 - 100 TeV
  75 + 2018-09-11T14:05:16: Requested RoI .............: Centre(RA,DEC)=(83.633333333333, 22.514444444444) deg, Radius=2 deg
  76 + 2018-09-11T14:05:16: RoI of data ...............: Centre(RA,DEC)=(83.633333333333, 22.514444444444) deg, Radius=2 deg
  77 + 2018-09-11T14:05:16: Selected RoI ..............: Centre(RA,DEC)=(83.633333333333, 22.514444444444) deg, Radius=2 deg
  78 + 2018-09-11T14:05:16: cfitsio selection .........: ENERGY >= 0.70794578 && ENERGY <= 100.00000000 && ANGSEP(83.633333,22.514444,RA,DEC) <= 2.000000
  79 + 2018-09-11T14:05:16: FITS filename .............: /var/tmp/tmp.1.IoZj2b[EVENTS][ENERGY >= 0.70794578 && ENERGY <= 100.00000000 && ANGSEP(83.633333,22.514444,RA,DEC) <= 2.000000]
  80 + 2018-09-11T14:05:16: === HESS observation "Crab" (id=023559) ===
  81 + 2018-09-11T14:05:16: Input filename ............: /project-data/hess/hess_dl3_dr1/data/hess_dl3_dr1_obs_id_023559.fits.gz
  82 + 2018-09-11T14:05:16: Event extension name ......: EVENTS
  83 + 2018-09-11T14:05:16: GTI extension name ........: GTI
  84 + 2018-09-11T14:05:16: === Event selection ===
  85 + 2018-09-11T14:05:16: Selected energy range .....: 0.660693 - 100 TeV
  86 + 2018-09-11T14:05:16: Requested RoI .............: Centre(RA,DEC)=(85.2533333381014, 22.014444444444) deg, Radius=2 deg
  87 + 2018-09-11T14:05:16: RoI of data ...............: Centre(RA,DEC)=(85.2533333381014, 22.014444444444) deg, Radius=2 deg
  88 + 2018-09-11T14:05:16: Selected RoI ..............: Centre(RA,DEC)=(85.2533333381014, 22.014444444444) deg, Radius=2 deg
  89 + 2018-09-11T14:05:16: cfitsio selection .........: ENERGY >= 0.66069345 && ENERGY <= 100.00000000 && ANGSEP(85.253333,22.014444,RA,DEC) <= 2.000000
  90 + 2018-09-11T14:05:16: FITS filename .............: /var/tmp/tmp.2.IAwBNH[EVENTS][ENERGY >= 0.66069345 && ENERGY <= 100.00000000 && ANGSEP(85.253333,22.014444,RA,DEC) <= 2.000000]
  91 + 2018-09-11T14:05:16: === HESS observation "Crab" (id=023592) ===
  92 + 2018-09-11T14:05:16: Input filename ............: /project-data/hess/hess_dl3_dr1/data/hess_dl3_dr1_obs_id_023592.fits.gz
  93 + 2018-09-11T14:05:16: Event extension name ......: EVENTS
  94 + 2018-09-11T14:05:16: GTI extension name ........: GTI
  95 + 2018-09-11T14:05:16: === Event selection ===
  96 + 2018-09-11T14:05:16: Selected energy range .....: 0.870964 - 100 TeV
  97 + 2018-09-11T14:05:16: Requested RoI .............: Centre(RA,DEC)=(82.0133333285646, 22.014444444444) deg, Radius=2 deg
  98 + 2018-09-11T14:05:16: RoI of data ...............: Centre(RA,DEC)=(82.0133333285646, 22.014444444444) deg, Radius=2 deg
  99 + 2018-09-11T14:05:16: Selected RoI ..............: Centre(RA,DEC)=(82.0133333285646, 22.014444444444) deg, Radius=2 deg
  100 + 2018-09-11T14:05:16: cfitsio selection .........: ENERGY >= 0.87096359 && ENERGY <= 100.00000000 && ANGSEP(82.013333,22.014444,RA,DEC) <= 2.000000
  101 + 2018-09-11T14:05:16: FITS filename .............: /var/tmp/tmp.3.879wq4[EVENTS][ENERGY >= 0.87096359 && ENERGY <= 100.00000000 && ANGSEP(82.013333,22.014444,RA,DEC) <= 2.000000]
  102 +
  103 +You may use the :ref:`csobsinfo` script to display a summary of the selected
  104 +events into the console:
  105 +
  106 +.. code-block:: bash
  107 +
  108 + $ csobsinfo debug=yes
  109 + Input event list, counts cube, or observation definition XML file [$HESSDATA/obs/obs_crab.xml] obs_crab_selected.xml
  110 + Output DS9 region file [ds9.reg]
  111 +
  112 +.. note::
  113 + The ``debug=yes`` attribute instructs :ref:`csobsinfo` to direct the log
  114 + file output also to the console. Duplication of log file output into
  115 + the console using the ``debug=yes`` attribute works for any tool or script.
  116 +
  117 +The output of :ref:`csobsinfo` is shown below.
  118 +:ref:`ctselect` selected 9675 events within an energy interval of
  119 +0.66 - 100 TeV.
  120 +This will be the energy range that you will from now on use for the data
  121 +analysis.
  122 +
  123 +.. code-block:: none
  124 +
  125 + 2018-09-11T20:30:16: +=========+
  126 + 2018-09-11T20:30:16: | Summary |
  127 + 2018-09-11T20:30:16: +=========+
  128 + 2018-09-11T20:30:16: === Observations ===
  129 + 2018-09-11T20:30:16: Unbinned observations .....: 4
  130 + 2018-09-11T20:30:16: Binned observations .......: 0
  131 + 2018-09-11T20:30:16: === Events ===
  132 + 2018-09-11T20:30:16: Number of events ..........: 9675
  133 + 2018-09-11T20:30:16: Number of bins ............: 0
  134 + 2018-09-11T20:30:16: === Pointings ===
  135 + 2018-09-11T20:30:16: Mean offset angle .........: Unknown
  136 + 2018-09-11T20:30:16: Mean zenith angle .........: 47.04 deg
  137 + 2018-09-11T20:30:16: Mean azimuth angle ........: 13.76 deg
  138 + 2018-09-11T20:30:16: === Energy range ===
  139 + 2018-09-11T20:30:16: Minimum energy ............: 660.693448007596 GeV
  140 + 2018-09-11T20:30:16: Maximum energy ............: 100 TeV
  141 + 2018-09-11T20:30:16: === Time range ===
  142 + 2018-09-11T20:30:16: MJD (days) ................: 53343.922 - 53347.933
  143 + 2018-09-11T20:30:16: UTC .......................: 2004-12-04T22:07:06 - 2004-12-08T22:22:02
  144 + 2018-09-11T20:30:16: Total ontime ..............: 6742.00 s = 112.37 min = 1.87 h
  145 + 2018-09-11T20:30:16: Total livetime ............: 6313.81 s = 105.23 min = 1.75 h
... ...
doc/source/users/tutorials/hess_dr1/skymap.png 0 → 100644
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doc/source/users/tutorials/hess_dr1/skymap.rst 0 → 100644
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  1 +.. _hess_dr1_sky_map:
  2 +
  3 +Generating a sky map from the events
  4 +------------------------------------
  5 +
  6 + .. admonition:: What you will learn
  7 +
  8 + You will learn **how to generate a sky map from the selected events**
  9 + and **how to find potential sources in the data**.
  10 +
  11 +As next step you will make a sky map of the selected events to inspect what's
  12 +in the data.
  13 +You do this using the :ref:`ctskymap` tool.
  14 +Since the data correspond to observations of the Crab nebula you should centre
  15 +the sky map on this source.
  16 +The energy limits of the sky map should be set to the energy interval of the
  17 +data (0.66 - 100 TeV).
  18 +To create the sky map, type:
  19 +
  20 +.. code-block:: bash
  21 +
  22 + $ ctskymap debug=yes
  23 + Input event list or observation definition XML file [events.fits] obs_crab_selected.xml
  24 + Coordinate system (CEL - celestial, GAL - galactic) (CEL|GAL) [CEL]
  25 + Projection method (AIT|AZP|CAR|GLS|MER|MOL|SFL|SIN|STG|TAN) [CAR]
  26 + First coordinate of image center in degrees (RA or galactic l) (0-360) [83.63]
  27 + Second coordinate of image center in degrees (DEC or galactic b) (-90-90) [22.01]
  28 + Image scale (in degrees/pixel) [0.02]
  29 + Size of the X axis in pixels [200]
  30 + Size of the Y axis in pixels [200]
  31 + Lower energy limit (TeV) [0.1] 0.66
  32 + Upper energy limit (TeV) [100.0]
  33 + Background subtraction method (NONE|IRF|RING) [NONE]
  34 + Output skymap file [skymap.fits]
  35 +
  36 +The resulting sky map, displayed using
  37 +`ds9 <http://ds9.si.edu>`_ with a square-root color scaling, is shown below:
  38 +
  39 +.. figure:: skymap.png
  40 + :width: 400px
  41 + :align: center
  42 +
  43 + *Sky map of the selected events centred on the Crab nebula*
  44 +
  45 +Based on the sky map you can now extract a model for all potentially significant
  46 +sources in the data.
  47 +You do this using the :ref:`cssrcdetect` script, and to extract only significant
  48 +sources, you should set the detection threshold for example to 5 sigma.
  49 +For convenience, the :ref:`cssrcdetect` script can also add a background model
  50 +component to the output
  51 +:ref:`model definition XML file <glossary_moddef>`.
  52 +Since the H.E.S.S. Instrument Response Function does not include a background
  53 +template, the ``IRF`` option will not work.
  54 +While sophisticated methods for the analysis of H.E.S.S. data still need to
  55 +be developed, you may try the effective area model ``AEFF`` that uses the
  56 +effective area as spatial template for the background component.
  57 +So, now type:
  58 +
  59 +.. code-block:: bash
  60 +
  61 + $ cssrcdetect
  62 + Input sky map file [skymap.fits]
  63 + Source model type (POINT) [POINT]
  64 + Background model type (NONE|IRF|AEFF|CUBE|RACC) [NONE] AEFF
  65 + Detection threshold (Gaussian sigma) [5.0]
  66 + Correlation kernel radius (deg) [0.1]
  67 + Output model definition XML file [models.xml] crab_models.xml
  68 + Output DS9 region file [ds9.reg] crab.reg
  69 +
  70 +Below an excerpt of the ``cssrcdetect.log`` log file.
  71 +Only one significant source was found, and its position is consistent with the
  72 +Crab nebula.
  73 +This is also illustrated in the figure below where the region file
  74 +``crab.reg`` that was produced by :ref:`cssrcdetect` was overlaid with
  75 +`ds9 <http://ds9.si.edu>`_
  76 +on the sky map.
  77 +
  78 +.. code-block:: none
  79 +
  80 + 2018-09-11T20:32:20: +==================+
  81 + 2018-09-11T20:32:20: | Source detection |
  82 + 2018-09-11T20:32:20: +==================+
  83 + 2018-09-11T20:32:20: === Iteration 1 ===
  84 + 2018-09-11T20:32:20: Map maximum ...............: 11.1003120131
  85 + 2018-09-11T20:32:20: Src001 position ...........: (RA,Dec)=(83.6192131308071,22.0199996472185)
  86 + 2018-09-11T20:32:20: === Iteration 2 ===
  87 + 2018-09-11T20:32:20: Map maximum ...............: None above threshold
  88 +
  89 +.. figure:: skymap_crab.png
  90 + :width: 400px
  91 + :align: center
  92 +
  93 + *Sky map of the selected events centred on the Crab nebula*
  94 +
  95 +The
  96 +:ref:`model definition file <glossary_moddef>`
  97 +``crab_models.xml`` that was generated by :ref:`cssrcdetect` is shown below.
  98 +It contains a point source ``Src001`` at the position of the Crab nebula
  99 +and an effective area background model scaled by a spectral power law as
  100 +background component.
  101 +
  102 +.. code-block:: xml
  103 +
  104 + <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  105 + <source_library title="source library">
  106 + <source name="Src001" type="PointSource">
  107 + <spectrum type="PowerLaw">
  108 + <parameter name="Prefactor" value="1" error="0" scale="5.7e-18" min="0" free="1" />
  109 + <parameter name="Index" value="1" error="-0" scale="-2.48" min="-4.03225806451613" max="4.03225806451613" free="1" />
  110 + <parameter name="PivotEnergy" value="1" scale="300000" free="0" />
  111 + </spectrum>
  112 + <spatialModel type="PointSource">
  113 + <parameter name="RA" value="83.6192131308071" error="0" scale="1" free="1" />
  114 + <parameter name="DEC" value="22.0199996472185" error="0" scale="1" free="1" />
  115 + </spatialModel>
  116 + </source>
  117 + <source name="Background" type="CTAAeffBackground">
  118 + <spectrum type="PowerLaw">
  119 + <parameter name="Prefactor" value="1" error="0" scale="1e-13" min="0" free="1" />
  120 + <parameter name="Index" value="1" error="-0" scale="-2.5" min="-4" max="4" free="1" />
  121 + <parameter name="PivotEnergy" value="1" scale="1000000" free="0" />
  122 + </spectrum>
  123 + </source>
  124 + </source_library>
... ...
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