SMPTE 221 – Motion-Picture Film (70-mm) – Six-Track Audio Release Prints – Magnetic Striping
This standard specifies the location and dimensions of the magnetic recording stripes on 70-mm motion-picture film used for six-track magnetic audio release prints having a flat picture image with a maximum projection aperture of 1.914 in x 0.870 in (48.62 mm x 22.10 mm).
