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The ISO 217:1995 standard defines the RA and SRA paper formats.
These paper series are untrimmed raw paper. RA stands for “raw format A” and SRA stands for “supplementary raw format A”. The RA and SRA formats are slightly larger than the corresponding A series formats. This allows bleed (ink to the edge) on printed material that will be later cut down to size. These paper sheets will after printing and binding be cut to match the A format.
Paper in the RA and SRA series format is intended to have a 1:\sqrt{2} aspect ratio but the dimensions of the start format have been rounded to whole centimetres.
For example, the RA0 format would be \sqrt{1.05}*2^{-0.25} m \times \sqrt{1.05}*2^{0.25} m \approx 861.7 mm \times 1218.6 mm, which has been rounded to 860 mm \times 1220 mm.
The resulting real ratios are:
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