2.1.1435 Part 1 Section 21.2.2.12, backward (Backward)
a. The standard states that the value of the val attribute on non-scatter charts must be 0 or 0.5.
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Office allows the data range to include any non-negative number.
b. The standard states that the values of the val attribute are defined by the XML Schema double datatype.
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Office restricts the values of this attribute to be greater than 0 and not equal to INF, -INF, or Nan.