The exponent modifier specifies the power of 10 by which the nominal value of a constant is to be multiplied before it is converted to its internal binary representation. It can only be used with the fixed-point (H and F) and floating-point (E, D, and L) constants. The exponent modifier is written as En, where n can be either a decimal self-defining term, or an absolute expression enclosed in parentheses.
The exponent modifier affects each nominal value specified in the operand, whereas the exponent written as part of the nominal value subfield only affects the nominal value it follows. If both types of exponent are specified in a DC operand, their values are added together before the nominal value is converted to binary form. However, this sum must lie within the permissible range of -85 to +75, unless a type extension is specified.