Library /sys$common/syshlp/basichelp.hlb PRINT, USING, String format  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  All string format characters must start with a single quotation mark
  (').  The quotation mark reserves one character position.

  Character     Output

      L         Reserves one character position and left-justifies the
                field.

      R         Reserves one character  position  and  right-justifies
                the field.

      C         Reserves one character position and centers the field.

      E         Reserves one character position and expands the  field
                to hold the entire field.