Processing using Difmap
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Checking data
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We can using shao_get_visibilities to check how many visibilities owned by the data,
then decide whether use it or not

.. code:: bash

    python3 shao_get_visibilities.py J0646-20001023S-cln.uvf


Single file 
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.. code:: bash

    python run_difmap.py /the/directory/of/the/file.fits/

All processing data will be stored in the same directory.


Multiple files
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