numpy.ma.MaskedArray.__getslice__
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MaskedArray.__getslice__(i, j)[source]
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x.__getslice__(i, j) <==> x[i:j] Return the slice described by (i, j). The use of negative indices is not supported. 
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.MaskedArray.__getslice__.html