Create a uncertainty frame. The function will update the uncertainty plane which gives the standard deviation for the data. Gain is used in this function only to scale the data in constructing the deviation; the data is not scaled.
Parameters: | ccd_data : CCDData
gain : Quantity, optional
readnoise : Quantity
add_keyword : str, Keyword or dict-like, optional
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Returns: | ccd : CCDData
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Raises: | UnitsError
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