Artikel 16

For photographic film, each magazine used during an observation flight from the same sensor shall be numbered in sequence starting from one. Each frame on the original film negative exposed by each sensor shall be individually numbered in sequence, from the first frame to the last frame of that magazine of that sensor. In each case when the film is numbered using one or two numbers per frame, a single frame shall be defined without ambiguity by specifying either the number closest to the centre of the frame, or, in the event that the numbers are equidistant from the centre, the smaller whole number.