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3.1.2.2 Undefined Integers

The value of the keyword BLANK is used to identify undefined integer array values, which might result from data dropouts or from operations that are undefined (like a divide by zero). For 16-bit integers, the most commonly used value of BLANK is -32768, but users may choose the value most appropriate for their data. The BLANK keyword is not used for floating point data, where the IEEE NaN identifies undefined values.