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Verification of the Swift UVOT Grism Flux Calibration (2013)
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The verification has been split up by grism mode. The plots of the spectra below 
are showing wavelength offsets consistent with the determination of the 
anchor accuracy in 2014 which has been discussed elsewhere. The 
visible grism observations were mostly done without a lenticular filter, while the uv 
grism observations were mostly done using a lenticular filter. 


.. note::

   The 2014 change from using an ad-hoc correction to a theoretically sound 
   correction for the coincidence loss did not produce major changes, so the 
   verification presented here is representative. 

.. toctree::
   :maxdepth: 2

   fluxcal_verification_160.rst
   fluxcal_verification_160_fig1-7.rst
   fluxcal_verification_200.rst
   fluxcal_verification_200_figures.rst
   
Some of the spectra displayed have flux levels inconsistent with the known flux. In the 
2014 calibration of the effective area we found that nearly all these observations had 
problems related to field source spectra overlying the target or background.   
   
.. toctree::
   :maxdepth: 2

   fluxcal_verification_955.rst
   fluxcal_verification_955_figures.rst
   fluxcal_verification_1000.rst
   fluxcal_verification_1000_figures.rst