(Blank Control Editing)

  Causes embedded and trailing blanks to be treated as zeros within a
  numeric input field.  (Leading blanks are always ignored.) An
  all-blank field is treated as zero.

  It affects all subsequent I, B, O, Z, F, E, EN, ES, D, and G
  editing (in the same FORMAT statement) until another blank editing
  descriptor occurs.

  The BN and BZ descriptors supersede the default interpretation of
  blanks during execution of a particular input data transfer
  statement.