numpy.ma.MaskedArray.recordmask
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MaskedArray.recordmask
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Return the mask of the records. A record is masked when all the fields are masked. 
    © 2008–2016 NumPy Developers
Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.MaskedArray.recordmask.html