.MT [type] [title]Specify memorandum type and title.  Controls format of formal memoranda and must be specified after other elements, such as .TL, .AF, .AU, .AS, and .AE. User-supplied title is prefixed to page number.
0 | No type.  | 
1 | Memorandum for file (default).  | 
2 | Programmer's notes.  | 
3 | Engineer's notes.  | 
4 | Released paper.  | 
5 | External letter.  | 
| string | string is printed.  |