The real Attribute is used for assigning any real number in the range of 1.7E +/- 308, with 15 digits of precision. The editing dialog for real Attributes (displayed below) uses a simple text box for entering this number. This dialog can be invoked by clicking on one of the "Edit Default" buttons on the Attribute Definitions dialog (the same editing field appears on the right side of the Attributes panel when editing the value of a real Attribute for a specific element in the design).
