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+.. _maskedarray:
+
+
+Masked arrays are arrays that may have missing or invalid entries.
+The :mod:`numpy.ma` module provides a nearly work-alike replacement for numpy
+that supports data arrays with masks.
+
+
+.. toctree::
+ :maxdepth: 2
+
+ maskedarray.generic
+ maskedarray.baseclass
+ routines.ma \ No newline at end of file