The `astropy.nddata.StdDevUncertainty` is a class in the Astropy package for Python that represents the uncertainty in data as standard deviation values. It provides a way to attach uncertainties to numerical data, allowing users to perform error propagation and analysis on numerical datasets. This class is designed to work with multi-dimensional arrays and provides various methods and operations for working with uncertainties, such as arithmetic operations, statistical analysis, and uncertainty propagation.
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