ST 203:2003 : For Motion-Picture Film (35-mm) — Prints — Two-Track Photographic Analog Audio Records
The Society of Motion Picture and Television Engineers eBooks · 2003
(1.1) This standard specifies the lateral location and dimensions of two-track variable-area analog audio records on 35-mm motion-picture prints. (1.2) This standard also specifies the area scanned in the audio reproducer.