Description:Keyword declaring whether zero and negative values may occur in the data section. The following key words are allowed:
Syntax:Zero/negative values code: <zero / neg. values keyword>
Zero/negative values code: zero/negative possible
Explanation for zero and negative values
Short statement why 0 or negative values may or may not occur.
Zero/negative values: <freetext keywords explaining zero / neg. values>
Zero/negative values: Zero and neg. values may appear due to statistical variations at very low concentrations
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