|Description:||Returns a positive model number that is almost negligible compared to unity in the model representing real numbers.|
|Class:||Inquiry function; Generic|
|Arguments:||X must be of type real; it can be scalar or array valued.|
|Results:||The result is a scalar of the same type and kind parameters as X. The result has the value b1-p. Parameters b and p are defined in Section D.2.|
If X is of type REAL(4), EPSILON (X) has the value 2-23.