Section 10,17: E

 Ew.d[Ee] (Exponential Editing)

 On input, E performs the same as F format.

 On output, E transfers the value of the corresponding I/O list
 element, rounded to "d" decimal digits and right-justified to an
 external field "w" characters long.  "d" specifies the size of the
 fraction and "e" specifies the size of the exponent.  If the value
 does not fill the field, leading spaces are inserted; if the value
 is too large for the field, the entire field is filled with
 asterisks.

 The term "w" must be large enough to include all of the following:
 a minus sign (when necessary) or a plus sign (if SP editing is in
 effect), a zero, a decimal point, "d" digits, and an exponent.

 Therefore, to accommodate all possible components of the standard
 form, the term "w" must be greater than or equal to "d"+7; if "e"
 is present, "w" must be greater than or equal to "d"+"e"+5.

 However, "w" can be as small as "d"+5 or "d"+"e"+3 and still allow
 formatting of the value without error, if optional fields are
 omitted.  In this case, the sign is omitted (if the value is
 positive and SP editing is not in effect) and the zero to the left
 of the decimal point is also omitted, if necessary.