What does this chart relate to?

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Airman 1st Class
Sep 1, 2019
Hi A light-hearted post to see how quickly someone can answer this. Attached is a page from a UK National Archives AIR file from mid-1941. As it says it relates to a Blenheim but other aircraft have similar charts including the Lysander. What munition does the chart relate to?

AIR2-1642 question.JPG

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