(Blank Control Editing)

  Causes embedded and trailing blanks to be ignored within a numeric
  input field.  Leading blanks are always ignored, and an all blank
  field is always 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.