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While a series of matrices can often be combined into a single primary
data array by adding another dimension, to do so is not always
possible. For example, consider an array that consists of a digital
image accompanied by an array of quality flags, each of which
corresponds to a pixel on the original image. If the data type of the
flags differs from that of the image pixels, the flags cannot be
combined into the primary data array. One way is to have the data array
and flag arrays as separate image extensions. An alternative is to use
binary tables. Each row would contain data for one image. One column
would be a multidimensional array in floating point format, containing the
image, and another would be a multidimensional array in integer format,
containing the flags.