Tn (Tab to Position n)

  On input, starts the next read operation at the character position
  (within the record) indicated by position n.  For example, if an
  input statement reads a record containing:

     ABC   XYZ

  and this record is under the control of the FORMAT statement:

     10 FORMAT (T7,A3,T1,A3)

  On execution, the input statement would first read the characters
  XYZ and then read the characters ABC.

  On output, starts the next write operation at the character
  position n in the external record.

  The position specified must be an integer in the range 1 through
  the size of the record.