ESw.d[Ee] (Exponential Editing:  Scientific form)

  On input, ES 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.  The real value is output in
  scientific notation, where the absolute value of the significand is
  greater than or equal to 1 and less than 10 (unless the output
  value is zero).

  "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), one digit, 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.

  The exponent field width ("e") is optional; if omitted, the default
  is value is 2.  If "e" is specified, the "w" should be greater than
  or equal to "d"+"e"+5.